Shout out to Rosco's for letting you use their barrel. I will be buying their products from now on. It would have been sweet had they sent you a new barrel with it for comparison. Maybe next time.
Since I found a local barrel manufacturer I've used Rosco barrels. Also props to them to send off a barrel to a TH-cam gunsmith to critique and show their stuff.... Regardless of outcome.
Nitride is no joke. I've drilled multiple gas blocks for taper pins and my drill press zips right through phosphated gas blocks. With a nitride gas block, I was amazed and perturbed by how hard I had to lean on it before the bit stopped chattering.
Chad, with someone of your knowledge, I think it would be great to see an in-depth AR style rifle cleaning video- if you ever find the time. Awesome stuff.
Drop the fieldstripped rifle in a tub of CLP, let stand for 72hrs, remove, scrub parts with nylon brush, run through parts cleaner with very mild solvent/degreaser(simple green), rinse with water, dry thoroughly with pressurized air, lube all parts and lightly coat all steel parts with CLP. We used to do that while on post deployment leave, everything but the optics, and lowers went into the bins, and when we got back you could see carbon settled on the bottom, and it was way more than you thought your rifle had. I currently have an Anderson RF-85 upper. They claim you don't need lubrication, and warn against using lubricant. I run my upper wet, and I keep it wet when at the range and at home I keep a light coat of oil. If I need more than a mag for self defense then I'm not doing it right, or it's the cops at my door, which is a slim to none chance for me. And in reality, you don't need to get every last bit of carbon, and honestly you shouldn't remove it all. It's not worth the time and effort taken to achieve, and in my opinion, it's not healthy for the firearm. Carbon isn't the enemy, your bore, chamber, barrel extension, bolt face, bearing surfaces, and BCG should be clean of build up and excessive carbon. But the first three should be the main focus for being the cleanest and the rest you can get the majority and not have any operational or excess wear issues. The biggest place I see people missing is in the FCG and buffer assembly and tube, as well as their gas tube and gas key. If you have coatings that will withstand it, break/parts cleaner works magic on carbon. I might get chastised for saying that, but I used more of that stuff in the military than I ever did as a mechanic.
@@hellcatdave1 never said it was. It's what we could use in the military and I have used gallons of the stuff. It comes down to preference and how many different products you want to use and have on hand. For most people, they want a few. I have lost count of the number of products I have or have used. For the purposes of cleaning after the range, CLP is great. You can wet the firearm, put it in the case and head home. After a couple hours it has worked it's way in to breakdown most the carbon build up, or if you kept applying it at the range and started with a well lubricated firearm you can likely wipe most the carbon off and have minimal time scraping and all that. For a deep professional cleaning I use several products and in different stages. I've never had an issue with CLP besides its heat resistance and the fact that you have to apply it more often than most oils. But in the military that was t really an issue as we had gallons of the stuff at any point in time and usually did some training with our rifles at least once a month. I've had CLP restore function to an M9 that spent 2 weeks in a humid and damp Texas summer where it was starting to rust and was inoperable. After cleaning and a little scrubbing to clear up the rust it was as good as before. I won't say new because it wasn't, but it was partly due to the basic issue cloth holster that it was stored in.
Built a handful of my own ARs over the years, learned more from this guy in the past week of watching the videos than I have from any one Ive talked with. From cleaning rifles and reading barrels. Blows my mind how technical this can really get, but its made where anyone can pickup the knowledge. Great work
And THIS, Boys and Girls, is why I run Rosco barrels on ALL of my new AR platform builds. Good on ya, Rosco! Customer for life here. Thanks for the video and proof that I have made good choices in my barrel selections.
In short, once your gas port erosion begins to vent excessively and creates a tapered valley in the barrel, it's only a matter of time until the muzzle tolerance begins to open up significantly. Awesome video and thanks for taking the time to share your findings wit us. You've got my subscription.
I know right & thanks to kotaboy bcg video i ran into chad as i hear people call him he definately earn$ hi$ money talk about a WEALTH of Knowledge plus the Honesty
as an avid ar enthusiast, this channel is a gold mine of information! thank you so much for sharing your knowledge.. now if i even had 10% of the gauges you do!
17:10 I haven't seen one of those push-pump solvent jars since I was 17 years old (a LONG time ago) repairing power supplies for NCR mainframe computers. We used them to dispense isopropanol to clean solder flux from circuit boards. As if I didn't LOVE your channel enough already ... thanks for the ear-to-ear flashback smile.
It's really interesting to me how the erosion of the gas port occurs towards the _muzzle_ and not the chamber. That's the opposite of what I'd assume would happen. Very educational.
Yeah, me too, but then when you rethink it it makes perfect sense. The gas isn't forced through the port til after the bullet passes the port so it's like back pressure...
I'd have thought the same because the combustion contaminants arrive at the gas port from the chamber side. But I guess it's because the round drags the plume of contaminants past the gas port and the gas port is a "catch" for the stream of contaminants, eroding the muzzle-side lip of the port.
It’s like driving over a pothole. The first edge of the pothole doesn’t take the impact of your tire but the second does. The gasses are contained until they pass the chamber end of the gas port and flow over it then crash into the muzzle side of the port.
Depends on what they consider accuracy issues, there is a place in las vegas that doesn't swap the barrels until they notice tumbling at 15-20 yards with full auto mag dumps. if you are hunting you would probably swap it a lot sooner
This is why I love and prefer Rosco barrels. They come dimpled but you can still pin the gas block if you have a jig or take it to your gunsmith. I currently have about 15k rds through my 10.5 rosco and it only sees solvent, patches and a nylon brush if needed every 1000 rounds. For those that say I should clean it more, it's my training gun and rosco has a decent price when it comes to barrels. I'll buy a new one when it's time.
Man...my 10.3 ballistic advantage "hansen" barrel was torched at 5,500! Of course, 90% of those were fairly hot Hornady 75bthps behind RL15 or Varget. I wonder how many more rounds it would have survived with an equivalent load of cooler burning ball powder? All academic at this point...ultimately barrels are dirt cheap compared to component prices or -god forbid- factory ammo. Good work on the autopsy! Subbed.
I subscribed within 2 minutes of the start of your video. I love the straight forward, technical approach and data driven analysis. I hope I'm not casting aspersions when i say it's like watching Chris from Small Arms Solutions from back in the day when he was gaining all the k knowledge he shares now. Excellent content sir, looking forward to perusing the rest of your videos.
Impressive! -Only barrel Ive ever shot out was a S & W CL 16" 5.45x39 that had around 15K as to round count, 70% of that number primarily ComBloc corrosive 7N6-(EXTREMELY well cared for during the rifles firing life-Windex-water wash n' flush minutes after shooting/cooling, then a deep hot-water rinse/scrub, dried, then followed by solvent clean usually no longer than 20 mins after each range trip)-....No S-L-O-W degradation in performance either! -One shot being accurate, the next: Keyhole city, but still hitting a 9" pie plate at 20 yards accurate. Every projo hitting plate sideways.... Picked up an Xtra ROSCO 10.5 pistol barrel, & although its not sitting in anything but a box & un-shot, I'm VERY impressed with just the machining/Surface finish for being a 120$ barrel!...>They are GORGEOUS!< WELL worth the cost IMHO....
This Channel is freaking amazing. I am from Australia, we arent even allowed AR's here and I love this stuff. Brilliant content, you know your stuff by all accounts. SUBSCRIBED.
Rosco barrels are the new supplier for the colt new / latest Cr prefix assembly lineup 💪🏼💪🏼💪🏼 milspec/ civilian proof . My 6933 commando , 6920 and my full size 20 in. Rifles all have rosco stamped / proof barrels and they all print 1.5 moa or better at 100 yards depending on ammo quality and weather .
My bet it that whatever muzzle device that was used was over torque. This is a very common problem. 25 ft/lbs is too much torque. Yet this seems to be the generally accepted consensus. According to Joe Carlos, a precision AR gunsmith, 8 ft/lbs is the most you should ever use on any muzzle device. He's done more testing on these kind of things than anyone else I've heard of. He also suggests using Loctite or Rocksett to keep your device from coming loose. He found in testing that the standard 25 ft/lb. figure constricts the barrel leading to this exact inaccuracy condition. Just my two cents.
I have nothing to do with guns, I am an aerospace and AI engineer, but I love your beautifully machined gages and that little acetone squirty thingy just made me happy somehow 😄
@@jonathonschram3429 Stole this from the AK subreddit because I don't think I can say it any better, but I researched this on AKs and found this to be very informative: "Everything pre-AK-74 used a 45o gas block and gas port. Early AK-74s also used a 45o gas block and port until they realized it was causing bullet shearing. The AK-74 switched to using a 90o gas port and gas block because of this. Everything afterward did, too, simply because it was easier to only have to drill one kind of hole and make one kind of gas block for everything. The gas port angle is what is important. Romania used 45o gas blocks on their AK-74s, but did not experience bullet shear due to the fact the gas port itself in the barrel was drilled at a 90o angle. Basically, it doesn't matter." Also, I believe a 45 degree gas port will lead to quicker gas port erosion...look at how the gas port eroded on this 90 degree gas port...now take that and start with a 45 degree gas block, it's just gonna accelerate the erosion.
Rosco barrels are the most underrated barrels, I got an 11 inch on a 2A armament handguard with a basic ass upper receiver, I'm getting better shot groups on my 11in then my 16in
Great 🤦♂️🤦♂️🤦♂️🤦♂️🤦♂️, Now my OCD has me looking for ALL these wear guages. I love this bore scope. I have one that I never can seem to keep in focus. As for this barrel, 26,750 rounds of full auto. And we don't know what type of ammo they even used during this test. It goes to show you how much abuse this barrel took and how well it held up. Id bet a $1.00 to a Dozen doughnuts they tested this barrel with a can on it. And that probably caused the excessive muzzle end wear at nearly 27-K rounds. Btw, GREAT VIDEO and I'm a new SUB after watching this and several other of your videos. Your NO BS approach to just giving is the facts. And if you do involve your opion you are very admit about telling the viewers that it's just that. And thats something that its getting harder and harder to find today. Especially when you have manufacturers paying for reviews of there products. Especially in the firearms world.
I also am guessing due to it being short and the port pushing gas forward towards muzzle combined as mentioned possible increased back pressure from suppressor or similar muzzle device, that area became the hot bed for wear. Very short dwell time plus inability to expel gas aka back Pressure. Still amazing ability to demonstrate functional cohesiveness of rest of barrel. Impressive.
Amazing what these little rifles will take when they're set up properly with good quality components. We several older Colt SP-1's that are used as ranch rifles, all with pretty heavy use and high round counts. They just seem to keep going and going.
I just picked up one of these 10.5” Rosco barrels on sale for $99 bucks. Can’t beat that deal. The gas port size on the barrel I bought says .75 so it’s going to be over gassed but at least it will eat anything I feed it.
0.750" is the gas block size. That is the outside diameter of the barrel where the gas block attaches. It doesn't have anything to do with the size of the gas port or the rifle being over gassed.
@@littlejackalo5326 you are 100% correct. I got a bit confused but yes that’s correct. One thing I do NOT understand though is why most companies don’t list the actual gas port size? Why is it like some secret spec they don’t want the public knowing lol. I would have liked to know my gas port size.
Very impressive. My handgun has over 30k rounds through it but non of my rifles have anything close to that number. Can't wait to see how my rifles will be when they are at those usage.
I can't say for certain because I've never tested the phenomena in controlled conditions but I think the accuracy issue is caused by a quasi internal version of a damaged crown. We see accuracy issues with a damaged crown because the propellant gasses are imparting an interrupted spin and or flight pattern after the bullet has left the lands. When you combine 1) the muzzle end erosion - which may mean that through part of the barrel the bullet is not being influenced, or not influenced greatly enough, by the lands: with 2) the troth cut just forward of the gas port - that irregular flow of propellant gases imparting force on the bullet may be interrupting the spin and flight path of the bullet in the same way that a damaged crown would. . It's an oddity that we would see the same phenomena occur internally like this: or at least it's an oddity with *newer* guns. This is not horribly uncommon to see in *surplus* guns in which both ware has reduced the internal diameter of the lands and erosion has left pock marks or holes which create very similar conditions. It's not something you'd ever worry about on ARs because rarely do you see AR barrels which have been worn away to an extent that lands are far away enough from the round that an internal irregular gouge like the gas port erosion would be able to greatly influence the round.
I would like to point out one thing you may have overlooked here. With that much erosion at the muzzle, you essentially have a tapered barrel, As your erosion gauge clearly shows. This would potentially render the straightness gauge test irrelevant in this case. This could potentially prevent contact of the gauge rod at the eroded end, where it would normally contact if it were bent with minimal erosion, allowing it to slip through unimpeded. It likely is essentially straight however. Just something to consider.
not even almost. it was 26k rounds before the barrel was yanked off because it couldn't make a round hole in the target at a few yards. i'm assuming this was a range rental so it was likely never shot for groups, so they weren't paying attention to accuracy at all. the accuracy probably noticeably suffered after a few hundred rounds of auto. even conservative semi auto shooting that isn't getting the barrel too hot to touch will have a substantial accuracy degradation before 3k rounds.
I had 2 Rosco 13.7 mid .223 Wylde barrels with cycling issues so I spent 3x more and got the same sized Noveske but is the cold hammer forged flavor. Since the swap I haven't had any cycling issues. It runs like a clock.
26,750 rounds f/a! That is very impressive. Anyone who thought that Rosco barrels were cheap and poor quality should seriously re-think that. This barrel is a resounding endorsement of Rosco barrels.
Even with the gas port erosion the gas port is still smaller than many other mfg gas ports.The weapon seems to have been properly gassed.I've been overlooking Rosco and several other mfg but will be checking them out.I only buy AKs if Akoperators union clears them and now when I'm looking at barrels and bcgs I'll see if you clear them.
![อยู่คนเดียวกับเขา - ส้ม มารี (Zom Marie) [Official MV]](http://i.ytimg.com/vi/gq1cWAIQDLg/mqdefault.jpg)
Learned more about barrels in 17 minutes than 40 some odd years of shooting AR’s. Thank you Subscribed
Shout out to Rosco's for letting you use their barrel. I will be buying their products from now on. It would have been sweet had they sent you a new barrel with it for comparison. Maybe next time.
Did you really? What did you learn, exactly?
I've got a new respect for Rosco barrels.
Damn at todays ammo price that barrel shot about $18,500 through it.
That’s absolutely insane
Update: at today's prices its closer to $25,000 of ammo
Actually it's only about 12k worth of ammo and has been for well over a year
Ya, they got their money's worth out of it. I wouldn't be surprised if Rosco asks to use this video in their advertising.
@@billstevens5277why? It’s a worn out barrel, what does this prove to you? Olympic arms barrels would go 50,000 +
Since I found a local barrel manufacturer I've used Rosco barrels. Also props to them to send off a barrel to a TH-cam gunsmith to critique and show their stuff.... Regardless of outcome.
Nitride is no joke. I've drilled multiple gas blocks for taper pins and my drill press zips right through phosphated gas blocks. With a nitride gas block, I was amazed and perturbed by how hard I had to lean on it before the bit stopped chattering.
Thank you rossco for the opportunity to see this
I love watching this guys videos but he makes me want to spend a small fortune buying the stuff he has.
A tour of the shop or video about all his equipment and what they do would be fantastic
I'll do that.
Same here!
@@SchooloftheAmericanRifle hell yeah
Seriously.. all those wonderful toys
Chad, with someone of your knowledge, I think it would be great to see an in-depth AR style rifle cleaning video- if you ever find the time. Awesome stuff.
Certainly
A live Q&A would be incredible.
Drop the fieldstripped rifle in a tub of CLP, let stand for 72hrs, remove, scrub parts with nylon brush, run through parts cleaner with very mild solvent/degreaser(simple green), rinse with water, dry thoroughly with pressurized air, lube all parts and lightly coat all steel parts with CLP. We used to do that while on post deployment leave, everything but the optics, and lowers went into the bins, and when we got back you could see carbon settled on the bottom, and it was way more than you thought your rifle had. I currently have an Anderson RF-85 upper. They claim you don't need lubrication, and warn against using lubricant. I run my upper wet, and I keep it wet when at the range and at home I keep a light coat of oil. If I need more than a mag for self defense then I'm not doing it right, or it's the cops at my door, which is a slim to none chance for me. And in reality, you don't need to get every last bit of carbon, and honestly you shouldn't remove it all. It's not worth the time and effort taken to achieve, and in my opinion, it's not healthy for the firearm. Carbon isn't the enemy, your bore, chamber, barrel extension, bolt face, bearing surfaces, and BCG should be clean of build up and excessive carbon. But the first three should be the main focus for being the cleanest and the rest you can get the majority and not have any operational or excess wear issues. The biggest place I see people missing is in the FCG and buffer assembly and tube, as well as their gas tube and gas key. If you have coatings that will withstand it, break/parts cleaner works magic on carbon. I might get chastised for saying that, but I used more of that stuff in the military than I ever did as a mechanic.
@@Deathbomb9 CLP isn't the best lube. It kind of fights itself.
@@hellcatdave1 never said it was. It's what we could use in the military and I have used gallons of the stuff. It comes down to preference and how many different products you want to use and have on hand. For most people, they want a few. I have lost count of the number of products I have or have used. For the purposes of cleaning after the range, CLP is great. You can wet the firearm, put it in the case and head home. After a couple hours it has worked it's way in to breakdown most the carbon build up, or if you kept applying it at the range and started with a well lubricated firearm you can likely wipe most the carbon off and have minimal time scraping and all that. For a deep professional cleaning I use several products and in different stages. I've never had an issue with CLP besides its heat resistance and the fact that you have to apply it more often than most oils. But in the military that was t really an issue as we had gallons of the stuff at any point in time and usually did some training with our rifles at least once a month. I've had CLP restore function to an M9 that spent 2 weeks in a humid and damp Texas summer where it was starting to rust and was inoperable. After cleaning and a little scrubbing to clear up the rust it was as good as before. I won't say new because it wasn't, but it was partly due to the basic issue cloth holster that it was stored in.
Built a handful of my own ARs over the years, learned more from this guy in the past week of watching the videos than I have from any one Ive talked with. From cleaning rifles and reading barrels. Blows my mind how technical this can really get, but its made where anyone can pickup the knowledge. Great work
And THIS, Boys and Girls, is why I run Rosco barrels on ALL of my new AR platform builds.
Good on ya, Rosco!
Customer for life here.
Thanks for the video and proof that I have made good choices in my barrel selections.
In short, once your gas port erosion begins to vent excessively and creates a tapered valley in the barrel, it's only a matter of time until the muzzle tolerance begins to open up significantly. Awesome video and thanks for taking the time to share your findings wit us. You've got my subscription.
The number one place to get true data and learn right here!
I know right & thanks to kotaboy bcg video i ran into chad as i hear people call him he definately earn$ hi$ money talk about a WEALTH of Knowledge plus the Honesty
as an avid ar enthusiast, this channel is a gold mine of information! thank you so much for sharing your knowledge.. now if i even had 10% of the gauges you do!
They should pay you for this... Because of your review, I'm looking at buying their product.
This video will probably sell a lot of barrels for them
I wouldn't take the money because it would mean I can be accused of bias.
@@SchooloftheAmericanRifle we need more folks like you, man.
why do you think they sent him the barrel...
17:10 I haven't seen one of those push-pump solvent jars since I was 17 years old (a LONG time ago) repairing power supplies for NCR mainframe computers. We used them to dispense isopropanol to clean solder flux from circuit boards. As if I didn't LOVE your channel enough already ... thanks for the ear-to-ear flashback smile.
Thank you for posting this. It gives me great confidence and reassurance my rosco 13.7 was a good choice.
I love these videos. Learning way more about firearms in these short videos than I have in the past 20 years in the military and civilian.
That’s a dam good testament of Roscommon barrels! Ordered a 12.5 for my next build.
I've never been more proud to run Rosco barrels
It's really interesting to me how the erosion of the gas port occurs towards the _muzzle_ and not the chamber. That's the opposite of what I'd assume would happen. Very educational.
Yeah, me too, but then when you rethink it it makes perfect sense. The gas isn't forced through the port til after the bullet passes the port so it's like back pressure...
I believe this occurs as a result of a concept called dwell time.
I'd have thought the same because the combustion contaminants arrive at the gas port from the chamber side. But I guess it's because the round drags the plume of contaminants past the gas port and the gas port is a "catch" for the stream of contaminants, eroding the muzzle-side lip of the port.
It’s like driving over a pothole. The first edge of the pothole doesn’t take the impact of your tire but the second does. The gasses are contained until they pass the chamber end of the gas port and flow over it then crash into the muzzle side of the port.
@@me2bfc perfect analogy
So basically, there's no way your average shooter would ever need to replace one of these barrels.
Depends on what they consider accuracy issues, there is a place in las vegas that doesn't swap the barrels until they notice tumbling at 15-20 yards with full auto mag dumps. if you are hunting you would probably swap it a lot sooner
26,000 rounds that's like 26 range visits for me.
@@muffemod You shoot roughly 780 rounds each range visit?
@@muffemod where are you finding ammo to shoot 1000 rounds per outing
muffemod I know right.....
This is why I love and prefer Rosco barrels. They come dimpled but you can still pin the gas block if you have a jig or take it to your gunsmith. I currently have about 15k rds through my 10.5 rosco and it only sees solvent, patches and a nylon brush if needed every 1000 rounds. For those that say I should clean it more, it's my training gun and rosco has a decent price when it comes to barrels. I'll buy a new one when it's time.
Love that you made this video. I just bought a rosco bloodline 11.5”
I just bought one recently also
@@vanderwell07ify How do you gentlemen like them? I'm about trying to decide on their 11.5 or 12.5 for my next build. Any info would be great
Good to go!
Man...my 10.3 ballistic advantage "hansen" barrel was torched at 5,500! Of course, 90% of those were fairly hot Hornady 75bthps behind RL15 or Varget. I wonder how many more rounds it would have survived with an equivalent load of cooler burning ball powder? All academic at this point...ultimately barrels are dirt cheap compared to component prices or -god forbid- factory ammo.
Good work on the autopsy! Subbed.
I subscribed within 2 minutes of the start of your video. I love the straight forward, technical approach and data driven analysis. I hope I'm not casting aspersions when i say it's like watching Chris from Small Arms Solutions from back in the day when he was gaining all the k knowledge he shares now.
Excellent content sir, looking forward to perusing the rest of your videos.
Impressive!
-Only barrel Ive ever shot out was a S & W CL 16" 5.45x39 that had around 15K as to round count, 70% of that number primarily ComBloc corrosive 7N6-(EXTREMELY well cared for during the rifles firing life-Windex-water wash n' flush minutes after shooting/cooling, then a deep hot-water rinse/scrub, dried, then followed by solvent clean usually no longer than 20 mins after each range trip)-....No S-L-O-W degradation in performance either!
-One shot being accurate, the next: Keyhole city, but still hitting a 9" pie plate at 20 yards accurate. Every projo hitting plate sideways....
Picked up an Xtra ROSCO 10.5 pistol barrel, & although its not sitting in anything but a box & un-shot, I'm VERY impressed with just the machining/Surface finish for being a 120$ barrel!...>They are GORGEOUS!<
WELL worth the cost IMHO....
How have I gone on this long without knowing about your channel. This is gold. You've earned my interest and a subscriber.
This Channel is freaking amazing. I am from Australia, we arent even allowed AR's here and I love this stuff. Brilliant content, you know your stuff by all accounts. SUBSCRIBED.
You should be allowed to own an AR15. Leftist bedwetting is ruining the world.
@@GTFBITK Freemen don't ask
This video is the reason I bought rosco for my last build. Absolute best commercial ever
Sold me on the quality and craftsmanship of this companies barrels. Thank you, very impressive review.
Considering how relatively inexpensive Rosco's barrels are, this is very impressive
NITRIDE is damn impressive!
Please do more barrels ! This is awesome
The gas port erosion is super interesting. It almost mimics running water erosion/undermining in soil.
Yep, that trench looks like a water erosion path for sure. Good analogy.
Having a technical background & being a shooter, I REALLY appreciate the technical reviews. Great job!
Rosco barrels are the new supplier for the colt new / latest Cr prefix assembly lineup 💪🏼💪🏼💪🏼 milspec/ civilian proof . My 6933 commando , 6920 and my full size 20 in. Rifles all have rosco stamped / proof barrels and they all print 1.5 moa or better at 100 yards depending on ammo quality and weather .
My bet it that whatever muzzle device that was used was over torque. This is a very common problem. 25 ft/lbs is too much torque. Yet this seems to be the generally accepted consensus. According to Joe Carlos, a precision AR gunsmith, 8 ft/lbs is the most you should ever use on any muzzle device. He's done more testing on these kind of things than anyone else I've heard of. He also suggests using Loctite or Rocksett to keep your device from coming loose. He found in testing that the standard 25 ft/lb. figure constricts the barrel leading to this exact inaccuracy condition. Just my two cents.
Wow, that was thorough! I had no idea that many tools/check devices existed. I'm impressed!
I have nothing to do with guns, I am an aerospace and AI engineer, but I love your beautifully machined gages and that little acetone squirty thingy just made me happy somehow 😄
I'm feeling REALLY good now about my Rosco barrel that I just bought !
A new favorite! Love the barrel autopsy!
I felt like I got to know that barrel's life. Keep up the amazingly detailed work!
Just picked up a Rosco Manufacturing 12.5" barrel to build a new upper...can't wait to start my attempt at 26,000 rounds
This is one of my favorite channels.
That's reassuring since I recently finished a build with a Rosco 14.5 .223 Wylde barrel. Haven't had a chance to shoot it yet because if the pandemic.
Very inlightning insight into the whole world of barrel wear.
Was on the fence about buying a Rosco for my next build. I am no longer on the fence.
I wonder what erosion on LMT’s 45 degree gas ports look like
I have been wondering this as well. Some of the claims seem pretty dubious...but I want to see a report from a 3rd party.
@@jonathonschram3429 Stole this from the AK subreddit because I don't think I can say it any better, but I researched this on AKs and found this to be very informative:
"Everything pre-AK-74 used a 45o gas block and gas port. Early AK-74s also used a 45o gas block and port until they realized it was causing bullet shearing. The AK-74 switched to using a 90o gas port and gas block because of this. Everything afterward did, too, simply because it was easier to only have to drill one kind of hole and make one kind of gas block for everything.
The gas port angle is what is important. Romania used 45o gas blocks on their AK-74s, but did not experience bullet shear due to the fact the gas port itself in the barrel was drilled at a 90o angle.
Basically, it doesn't matter."
Also, I believe a 45 degree gas port will lead to quicker gas port erosion...look at how the gas port eroded on this 90 degree gas port...now take that and start with a 45 degree gas block, it's just gonna accelerate the erosion.
Rosco barrels are the most underrated barrels, I got an 11 inch on a 2A armament handguard with a basic ass upper receiver, I'm getting better shot groups on my 11in then my 16in
Great 🤦♂️🤦♂️🤦♂️🤦♂️🤦♂️, Now my OCD has me looking for ALL these wear guages. I love this bore scope. I have one that I never can seem to keep in focus. As for this barrel, 26,750 rounds of full auto. And we don't know what type of ammo they even used during this test. It goes to show you how much abuse this barrel took and how well it held up. Id bet a $1.00 to a Dozen doughnuts they tested this barrel with a can on it. And that probably caused the excessive muzzle end wear at nearly 27-K rounds. Btw, GREAT VIDEO and I'm a new SUB after watching this and several other of your videos. Your NO BS approach to just giving is the facts. And if you do involve your opion you are very admit about telling the viewers that it's just that. And thats something that its getting harder and harder to find today. Especially when you have manufacturers paying for reviews of there products. Especially in the firearms world.
I have a 11.5" Rosco barrel and I love it.
Super interesting and informative. You are a fine teacher. I'm sure your students know how lucky they are!
Excellent review. Good bench practices with your tools too.
Big fan of Rosco barrels.
That was awesome! I just discovered your channel a couple days ago and I am learning so much!
Thanks for these videos. 👍👍👍👍
Merry Christmas!
I also am guessing due to it being short and the port pushing gas forward towards muzzle combined as mentioned possible increased back pressure from suppressor or similar muzzle device, that area became the hot bed for wear. Very short dwell time plus inability to expel gas aka back Pressure. Still amazing ability to demonstrate functional cohesiveness of rest of barrel. Impressive.
I have one of these 10.5 rosco barrels. At least I know it could go about 26K rounds before being shot out. Another great informational video.
Unless your doing full auto mag dumps, it'll probably last longer than that on semi auto.
I'm loving these barrel autopsy videos! Keep up the great work!
Amazing what these little rifles will take when they're set up properly with good quality components. We several older Colt SP-1's that are used as ranch rifles, all with pretty heavy use and high round counts. They just seem to keep going and going.
I just picked up one of these 10.5” Rosco barrels on sale for $99 bucks. Can’t beat that deal. The gas port size on the barrel I bought says .75 so it’s going to be over gassed but at least it will eat anything I feed it.
0.750" is the gas block size. That is the outside diameter of the barrel where the gas block attaches. It doesn't have anything to do with the size of the gas port or the rifle being over gassed.
@@littlejackalo5326 you are 100% correct. I got a bit confused but yes that’s correct. One thing I do NOT understand though is why most companies don’t list the actual gas port size? Why is it like some secret spec they don’t want the public knowing lol. I would have liked to know my gas port size.
I just found this channel and almost immediately subscribed. Very informative and knowledgeable host
I love that your videos are just facts no fluf. please keep up the good work
Nothing else matters besides where I can find that thing you have your acetone in. I NEED THAT!
Rosco barrel added to my list. thanks.
Need more content Chad these videos are gold. Got a radian and bcm bcg if u need to make videos about em
Send them in for sure
@@Peaktac how do you go about doing that? There's literally no contact information on the website and he disallows messages on Instagram...
Thank you for these very informative videos, learning some great info; hello from Australia!
Very impressive. My handgun has over 30k rounds through it but non of my rifles have anything close to that number. Can't wait to see how my rifles will be when they are at those usage.
And I'm some how still learning stuff..ty
I wanna thank you for posting your videos.
Amazing work thank you. Cant wait to watch your content. Looks like I got a few days of watching.
I can't say for certain because I've never tested the phenomena in controlled conditions but I think the accuracy issue is caused by a quasi internal version of a damaged crown. We see accuracy issues with a damaged crown because the propellant gasses are imparting an interrupted spin and or flight pattern after the bullet has left the lands. When you combine 1) the muzzle end erosion - which may mean that through part of the barrel the bullet is not being influenced, or not influenced greatly enough, by the lands: with 2) the troth cut just forward of the gas port - that irregular flow of propellant gases imparting force on the bullet may be interrupting the spin and flight path of the bullet in the same way that a damaged crown would.
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It's an oddity that we would see the same phenomena occur internally like this: or at least it's an oddity with *newer* guns. This is not horribly uncommon to see in *surplus* guns in which both ware has reduced the internal diameter of the lands and erosion has left pock marks or holes which create very similar conditions. It's not something you'd ever worry about on ARs because rarely do you see AR barrels which have been worn away to an extent that lands are far away enough from the round that an internal irregular gouge like the gas port erosion would be able to greatly influence the round.
That's why long barrels are awesome. If you do happen to shoot it out cut it and start again.
I just wish I had half the quality tools used in your vids!! Great stuff, Just found your channel and it's really great content. Thank you.
Between this guy and Johnny Glocks, I’am a YT taught Armorer !!!!!
Enjoy all of your videos thank you.
Excellent video. Thank you for the education.
I would like to point out one thing you may have overlooked here. With that much erosion at the muzzle, you essentially have a tapered barrel, As your erosion gauge clearly shows. This would potentially render the straightness gauge test irrelevant in this case. This could potentially prevent contact of the gauge rod at the eroded end, where it would normally contact if it were bent with minimal erosion, allowing it to slip through unimpeded. It likely is essentially straight however. Just something to consider.
Great information
Rosco apparently makes damn fine barrels!
Love your vids man. Sharing a great deal of knowledge.
Awesome thanks for sharing your knowledge.
26k rounds before accuracy suffered? Take my $$$.
Great video btw
not even almost. it was 26k rounds before the barrel was yanked off because it couldn't make a round hole in the target at a few yards. i'm assuming this was a range rental so it was likely never shot for groups, so they weren't paying attention to accuracy at all. the accuracy probably noticeably suffered after a few hundred rounds of auto. even conservative semi auto shooting that isn't getting the barrel too hot to touch will have a substantial accuracy degradation before 3k rounds.
I had 2 Rosco 13.7 mid .223 Wylde barrels with cycling issues so I spent 3x more and got the same sized Noveske but is the cold hammer forged flavor. Since the swap I haven't had any cycling issues. It runs like a clock.
Fascinating, thank you.
26,750 rounds f/a! That is very impressive. Anyone who thought that Rosco barrels were cheap and poor quality should seriously re-think that. This barrel is a resounding endorsement of Rosco barrels.
This Garand Thumb's barrel? j/k
that would be more like 260,000
I love my 7.5" Rosco 7.62x39 barrel ..... Mine has around 14,000 rounds through it .....
Great video ! I'm loving the your channel
Even with the gas port erosion the gas port is still smaller than many other mfg gas ports.The weapon seems to have been properly gassed.I've been overlooking Rosco and several other mfg but will be checking them out.I only buy AKs if Akoperators union clears them and now when I'm looking at barrels and bcgs I'll see if you clear them.
Nice work roscoe 25k+ on full auto that’s means on semi it will last a lifetime really good work
Great stuff Chad
Thumbs up appreciate the Autopsy videos...….
Lot to learn here, good video
Makes me feel better about buying a Rosco barrel about 6 months ago,
Wish we knew if it had been used with a suppressor or not. Great video.
Thanks for sharing that..... Very interesting
Very cool video, intressting, awsome
I got a 10.5 in 300acc, love it.
Anyone else smell the acetone when he used it or is it just me.
Rosco,s barrel line is colt , I worked on the barrell line at colt , the machines were taken out , to rosco,s
Nice!!! (Who knew there was so much to a barrel!!!)