12.5 inch barrel vs 13.7 inch barrel velocity

[mig1nc]

That is pretty impressive difference for 1.4” spread.

I'm speculating here but I bet the difference would be lower if we moved up from 55gr to 77gr at 5.56 pressure.


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[RennBaer]

The 13.9 only had 200 rounds down it when tested. Was a new builds. The 12.5 had about 500. 13.9 was shot suppressed yhm turbo t3. 12.5 shot cold u suppressed

13.9 handloaded 62gr gold dots 2.260 oal. Light crimp arplus 24.0 gr. 2766 fps avg

There's a good chance that the suppressor added a noticeable amount of velocity to the 13.9 compared to if you had shot it unsuppressed like you did the 12.5.

[bfoosh006]

This link has quite a bit of suppressed chrono data for 10.5", 11.5", 12.5" & 14.5".
https://www.ar15.com/forums/ar-15/Su...NE-/16-714088/

[markm]

There's a good chance that the suppressor added a noticeable amount of velocity to the 13.9 compared to if you had shot it unsuppressed like you did the 12.5.

Could be.. depending on the can. I think we did a can on/off test a month ago... showed like 10 fps gain on a 10.5 if I remember correctly.

[Strikefirst]

Next time I get out I'll test both with and without the can

[joedirt199]

I have 11.5, 12.5, 13.5 and 14.5 I need to sight in and chrono. I will get some numbers when the weather gets better. All are BCM except the 11.5 which is an Expo heavy from Primary Arms. All are suppressed.

[titsonritz]

I have 11.5, 12.5, 13.5 and 14.5 I need to sight in and chrono. I will get some numbers when the weather gets better. All are BCM except the 11.5 which is an Expo heavy from Primary Arms. All are suppressed.

Didn’t know BCM made a 13.5”.

[joedirt199]

It is a cut down 16". All mid gas except for 11.5 Expo.

[titsonritz]

It is a cut down 16". All mid gas except for 11.5 Expo.

Gotcha

[Wake27]

There's a good chance that the suppressor added a noticeable amount of velocity to the 13.9 compared to if you had shot it unsuppressed like you did the 12.5.

Based on what? I’ve only ever heard a minimal increase and my personal testing has shown that as well.


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