So this was just supposed to be a simple side by side comparison, but the comments have spoken. I'll soon do a retest without the suppressors, but I'll also compare all of the barrel lengths I own in 5.56mm, which are 10.3", 11.5", 12.5", 14.5", 16", and 18". I'll also add the details/specs on each one. Maybe I'll even throw in my 13" Galil ACE just for craps and giggles and to add another data point. I appreciate all of the feedback and comments. More to come soon
@@regulardudegungearreviewsh3132 I’m a stickler for 16 inch barrels but I’m pretty sure that I’m gonna go get me a 12 1/2 inch barrel. I am absolutely blown away by your results
Despite fast/slow barrel comments, it's still worthwhile to note that the velocities are close enough to overlap. In other words, velocities are so close that barrel construction can negate the difference
Barrel manufacturers, barrel batch, number of rounds through the barrels, gas system, suppressors, etc will all make a massive difference. Physics are physics- if all things are perfectly equal except for length, the longer barrel will be faster. Not by much, and this is largely overblown in importance, but they will be faster.
I have a second video that I did after I made this one that had more barrel lengths, and also went into the manufacturers of the barrels. But my 12.5" is a Criterion Core and the 14.5" is an LMT
Man, really appreciate the effort, but all we've learned is that you have a 14.5 barrel that clocks on the slow side and a 12.5 that clocks on the fast side, which is not unusual. The data you're looking for would require comparing like barrels of differing lengths in similar working conditions. Same suppressor, same gas block, etc. It would be best to narrow things down further by blocking off the gas ports.
Just wondering if the 12.5 inch has a carbine or midlength gas system?. Saw another vid that a midlength 12.5 barrel had higher fps than a 14.5 P/w with carbine gas system. Everyone speculated that with a carbine gas system more gas came back to the bcg than if it were a midlength gas system. Which would make a hypothetical sense. Subscribed. 😂 Heres my speculation based on your results. Without knowing the gas system length. 64g and below the 12.5 shot higher fps. I wanna say powder burn rate. 😂 I'm no scientist so I'm just guessing here. I have no idea if suppressors add or diminishes fps either.
Damn man, I’ve heard this same thing else we’re in the annals of the TH-cam’s. Couple things I am wondering, as all others have said 1) no suppressors please, it adds variables. 2) barrel makes and rifling types, as well as gas tube lengths 3) round counts or approximate round counts on each barrel. Barrels do speed up after a few hundred rounds. But to all the haters, ever see the DOD report on 11.5” with suppressor being equivalent to a 14.5”? Boggles the mind. I’ve seen similar between 12.5 and 14.5 on 556 elsewhere. It’s kinda fucked up man. But for the sake of science and the people, please god take the suppressors off before the crowds turn into mobs. They won’t be nice
that DOD claim was probably in reference to M855A1, which has been shown to have only about 100 fps difference between 14.5 and 11.5, because it's so hot
Garandthumb's test showed the opposite. It's odd how the 12.5 was consistently faster, you should try this test without the suppressors to see what results you get. Who made each barrel? Also what handguard is on that 12.5? Centurion?
Garand Thumbs video was probably the best comparison you could find, using all of the same brand barrels and profiles, just different lengths. But I am going to be doing a retest soon, with more barrel lengths added alao
@@dancarter7009 but to answer your question, the 12.5" is a Criterion Core with a 1/8 twist. The 14.5" is an LMT with a 1/7 twist. Both are carbine gas
@@regulardudegungearreviewsh3132 Thank you so much for the replies. Thats good to know as I have a Core 12.5 but haven’t gotten it put together yet. Keep up the awesome work brother! 🤙🏻
Based on how the heavier rounds were faster on the 14.5, the tolerance of the bore and rifling isn’t sealing lighter rounds as tight as the 12.5. But due to the larger and longer size of the heavier rounds the seal is just right where the powder burn allows the 14.5 to perform as expected with the added 2 inches. Just my guess
I think it's because of the general thinking that you'll lose velocity with every inch you take off of a barrel. But for whatever reason, there's not a loss between 12.5 and 14.5. And even some ammo is faster out of a 12.5". Classic Arms did a video comparing barrel length velocity a while back and saw pretty much the same data
I've got a separate vid coming where I test several guns suppressed and non, side by side. From what I've shot so far, not really much difference with my guns and cans
Not really a true comparison considering the suppressors and the different barrel twists. To get true test results, other than the length, everything else should be the same.
The test with the 62gr PMX X-TAC M855 was swap. The 12.5 should be 2852. It looks like the larger barrel favor heavier bullets and 62gr looks like the THRESHOLD/boundaries.
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So this was just supposed to be a simple side by side comparison, but the comments have spoken. I'll soon do a retest without the suppressors, but I'll also compare all of the barrel lengths I own in 5.56mm, which are 10.3", 11.5", 12.5", 14.5", 16", and 18". I'll also add the details/specs on each one.
Maybe I'll even throw in my 13" Galil ACE just for craps and giggles and to add another data point.
I appreciate all of the feedback and comments. More to come soon
Is the barrel twist rate the same or different?
And what is the gas system length?
@@RockOfAgesCFM both are carbine gassed
@@regulardudegungearreviewsh3132 what about the twist right on the barrel though?
@@regulardudegungearreviewsh3132 I’m a stickler for 16 inch barrels but I’m pretty sure that I’m gonna go get me a 12 1/2 inch barrel. I am absolutely blown away by your results
great comparison proving the magic of the 12.5" 5.56 barrel against the 14.5"
Despite fast/slow barrel comments, it's still worthwhile to note that the velocities are close enough to overlap. In other words, velocities are so close that barrel construction can negate the difference
Yes! Glad someone recognizes that
Seems the quality of the ammo has a bigger effect than barrel length
this is awesome, thank you for including the 75/77gr instead of just the 55/62gr. I guess I'm updating my 10.5 to 12.5
Can't go wrong with a 12.5" 🤙🏼
This was awesome man!!! And yes please throw in the galil on the next ones.
Already posted up, bro! BUT I did only test it with limited ammo. I got distracted adjusting my KNS piston and only had so much ammo. Lol
Interesting results!
Barrel manufacturers, barrel batch, number of rounds through the barrels, gas system, suppressors, etc will all make a massive difference. Physics are physics- if all things are perfectly equal except for length, the longer barrel will be faster. Not by much, and this is largely overblown in importance, but they will be faster.
How about twist rate?
It would make a difference but not massive.
@@justinpate3466 That's what I figured.
Great video! Would appreciate a list of the barrel mfgs and a test without the suppressors :)
Appreciate it! Retest coming soon
Solid data brother
Thank you sir!
Should add more data and details in your testing. Gas length, barrel material, and manufacture. Over all, interesting testing
Retest coming soon!
Who was the barrel manufacturers of the 12.5 an 14.5? Or did I miss that part ? Nice comparison!
I have a second video that I did after I made this one that had more barrel lengths, and also went into the manufacturers of the barrels. But my 12.5" is a Criterion Core and the 14.5" is an LMT
Great info , testing 👍😎
Man, really appreciate the effort, but all we've learned is that you have a 14.5 barrel that clocks on the slow side and a 12.5 that clocks on the fast side, which is not unusual. The data you're looking for would require comparing like barrels of differing lengths in similar working conditions. Same suppressor, same gas block, etc. It would be best to narrow things down further by blocking off the gas ports.
Yeah I'm not so sure about that. There's plenty of other data points out there that show the same, or very similar results
Just wondering if the 12.5 inch has a carbine or midlength gas system?. Saw another vid that a midlength 12.5 barrel had higher fps than a 14.5 P/w with carbine gas system. Everyone speculated that with a carbine gas system more gas came back to the bcg than if it were a midlength gas system. Which would make a hypothetical sense. Subscribed. 😂
Heres my speculation based on your results. Without knowing the gas system length. 64g and below the 12.5 shot higher fps. I wanna say powder burn rate. 😂 I'm no scientist so I'm just guessing here. I have no idea if suppressors add or diminishes fps either.
Both my 12.5 and 14.5 are carbine gas with carbine RE's
Damn man, I’ve heard this same thing else we’re in the annals of the TH-cam’s. Couple things I am wondering, as all others have said
1) no suppressors please, it adds variables.
2) barrel makes and rifling types, as well as gas tube lengths
3) round counts or approximate round counts on each barrel. Barrels do speed up after a few hundred rounds.
But to all the haters, ever see the DOD report on 11.5” with suppressor being equivalent to a 14.5”? Boggles the mind. I’ve seen similar between 12.5 and 14.5 on 556 elsewhere. It’s kinda fucked up man. But for the sake of science and the people, please god take the suppressors off before the crowds turn into mobs. They won’t be nice
Retest coming soon
that DOD claim was probably in reference to M855A1, which has been shown to have only about 100 fps difference between 14.5 and 11.5, because it's so hot
Garandthumb's test showed the opposite. It's odd how the 12.5 was consistently faster, you should try this test without the suppressors to see what results you get. Who made each barrel?
Also what handguard is on that 12.5? Centurion?
Garand Thumbs video was probably the best comparison you could find, using all of the same brand barrels and profiles, just different lengths. But I am going to be doing a retest soon, with more barrel lengths added alao
What are the barrel manufactures, twist rate,etc?
Sorry if I missed it. Thank you
Retest coming soon!
@@regulardudegungearreviewsh3132 look forward to it! 🤙🏻
@@dancarter7009 but to answer your question, the 12.5" is a Criterion Core with a 1/8 twist. The 14.5" is an LMT with a 1/7 twist. Both are carbine gas
@@regulardudegungearreviewsh3132 Thank you so much for the replies. Thats good to know as I have a Core 12.5 but haven’t gotten it put together yet. Keep up the awesome work brother! 🤙🏻
Is it the gas pressure difference from the suppressors. The 12.5 looks like a flow through. Not sure gore that would effect velocity
velocities seem higher than normal. machine calibrated?
Based on how the heavier rounds were faster on the 14.5, the tolerance of the bore and rifling isn’t sealing lighter rounds as tight as the 12.5. But due to the larger and longer size of the heavier rounds the seal is just right where the powder burn allows the 14.5 to perform as expected with the added 2 inches. Just my guess
Or it could be that the heavier bullets are loaded with slower powder, so there is more burn % in the longer barrel.
@@Subtlenimbus yea could be
I think they should be compared without the suppressors.
Retest coming soon
Hmm 🤔 interesting results.
11.5 s 12.5 please
I have the vid posted! Came out after this one. Check it out 🤙🏻
Huh! Any idea why the results are the opposite of what we’d expect?
I think it's because of the general thinking that you'll lose velocity with every inch you take off of a barrel. But for whatever reason, there's not a loss between 12.5 and 14.5. And even some ammo is faster out of a 12.5". Classic Arms did a video comparing barrel length velocity a while back and saw pretty much the same data
What is your twist rates on these barrels???
The 12.5" is 1-8 and the 14.5" is 1-7
Willing to bet the suppressors have something to do with these results.
I've got a separate vid coming where I test several guns suppressed and non, side by side. From what I've shot so far, not really much difference with my guns and cans
12.5" is king
Mine too 🤙🏼
What is the gas length of each rifle?
Carbine gas on both
What barrel in the 12.5 gun?
Criterion Core
gas port size is bigger 14.5 than the 12.5?
Not sure, exactly
What suppressors are on each gun?
Huxwrx Flow 762 Ti on the 12.5" and Huxwrx HX-QD 556 on the 14.5"
Not really a true comparison considering the suppressors and the different barrel twists. To get true test results, other than the length, everything else should be the same.
Yep, I do mention that in the follow up video where I have more barrel lengths in the mix
FIRST!
Great test.
Appreciate it sir!
Something tells me that 14.5 has way more rounds on it than the 12.5
It doesn't. The 12.5" has probably double the rounds the 14.5" has. But even that's pretty low,
Just dropping in to give you a like and a comment for the algorithm. I appreciate your content. Help me big time with the trigger install on my Galil
Really appreciate it sir!
garbage test with the suppressors on its ruins the whole thing....
Appreciate the views and feedback!
Not really if they both are using the same suppressor
The test with the 62gr PMX X-TAC M855 was swap. The 12.5 should be 2852. It looks like the larger barrel favor heavier bullets and 62gr looks like the THRESHOLD/boundaries.