AR15 Barrel Length and Velocity - WWSD
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- เผยแพร่เมื่อ 31 ต.ค. 2023
- CORRECTION:
I referred to PMC Bronze, the ammunition we used in this content, as M193 - which it is not. PMC Bronze is a civilian 223 Remington load, not specifically military M193 spec. I will have more content coming out discussing that in the future. That minor difference, however, does not change the point of the video itself in regards to barrel length and velocity differences with 223 (or 556).
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223/5.56 is a highly capable round...when it has sufficient velocity to perform. Barrel length plays a significant role in the velocity of the projectile. In this video we demonstrate the velocity of 55gr "M193" out of a 14.7, 16 and 20" WWSD, discuss what that means.
CORRECTION:
PMC Bronze is not M193. M193 data would be more interesting.
Question from a friend who hasn't quite kept up: did you guys finally manage to scare the copyright trolls back under the bridge?
Well technically your using 223 PMC bronze is 223 loading, not M193 5.56 it's 100 feet per second slower versus actual M193 5.56
That ammo might be a bit under pressured. An M16 firing M193 should produce a velocity around 3250fps.
PMC does not make a Bronze 5.56, only 223. Therefore no, you didn’t use 55gr M193, you used 55gr 223. This data is flawed because test barrel lengths for 223 Rem is 24” and test barrel lengths for 5.56 is 20”. 223 Rem needs a longer barrel to achieve the same velocity as 5.56. If you had used M193 spec ammunition you would have had a ~200FPS velocity increase from the same respective barrel length.
Pmc bronze 223 is 200 fps or so slower than real m193 like Winchester white box from lake city. I have one of the H&R m16a1 repro guns and get about 3250-3300 from Winchester and around 3050 from the Pmc. With that being said I can understand if you tested the Pmc bronze rather then a real m193 for the purpose of it being more reflective of what most people plink and compete with.
PMC Bronze is .223, not m193 5.56. PMCs x tac is loaded to 5.56 specs.
I SBR’d my KP15 for 300blk and sort of regret it, because for a 5.56 upper I’d be back at at least 16” for efficiency
He brought the Covenant Chronograph! WORT WORT WORT!!!
Just as a comparison, When Canada developed the C7, they went with a 20". The shorter C8 (carbine) was 14.5", but the Special forces wanted more velocity and the SFW program made a 15.8" (400 mm). The Canada C7a2 also shows you can reliably run a rifle gas system on a carbine buffer system.
Thank you for the metric conversion at
Loving my 16 inch faxon pencil barrel. The lightweight upper I put together pairs perfectly with the KP15 lower. Great video as always
Thanks for the video Karl and Russell.
I keep saying it and haven’t done it, but… I want to test if the 20” barrel gives an advantage in extreme cold above and beyond the usual velocity decrease from a shorter barrel, I think the longer “available burn time” should create more velocity. I shot M4s with M855 at -35° in a previous life, we had soot coming out our muzzles and the bullets were hitting the target sideways past ~400 yards.
Great that you showed the projectiles after velocity changes at the
In addition, the 5.56 not only from a 20" barrel but ALSO
Consistent ammo and not much difference in velocity between the barrel lengths. nice video thanks guys
Great video. I'm glad I didn't go crazy trying to get optics with BDCs tuned to the ammo or worrying a lot about the barrel length. I might just end up buying another upper with the 20" barrel after seeing this. I like these videos, even if they might be "reinventing the wheel".
Thank you for the video. It would be great to see a 10-12in barrel length for comparison.