Black River Tactical
BRT OPTIMUM Hammer Forged Chrome Lined Barrels - 11.5", 12.5", 14.5", 16"
BRT EZTUNE Preset Gas Tubes - PISTOL, CAR, MID, RIFLE
BRT Bolt Carrier Groups M4A1, M16 CHROME
BRT Covert Comps 5.56, 6X, 7.62
Is this how the 12.5" will be gassed as well?
Also, will the A5H2 run unsuppressed? Or will it not cycle at all?
ETA: To clarify my question on the A5H2, if it cycles reliably (unsuppressed) but doesn't lock back on an empty mag, then that's acceptable to me. But if it won't cycle at all, then that would be problematic...especially since now it's tough to pick up different A5 buffer weights.
Last edited by Ironman8; 08-11-20 at 14:34.
These barrels can certainly run un-suppressed with an A5H2 and mil-spec spring, but will have reduced reliability margin with weaker ammo.
M855 and M193 are fine, as is most good 223.
The PMC bronze and wolf steel cycle pretty slow and won't lock back with a loose hold, but even this is dependent on the muzzle device.
A good brake that eliminates recoil allows positive cycling even with a loose hold.
The popular green rifle spring, which is slightly stronger, takes a little more energy to compress.
Overall, it doesn't cycle quite as fast as we like with the heavier buffers, so as a blanket recommendation we're going with lighter buffers un-suppressed, which also allows some margin for slightly stronger springs.
Suppressed, the A5H2 does great with near zero gas blow back.
Black River Tactical
BRT OPTIMUM Hammer Forged Chrome Lined Barrels - 11.5", 12.5", 14.5", 16"
BRT EZTUNE Preset Gas Tubes - PISTOL, CAR, MID, RIFLE
BRT Bolt Carrier Groups M4A1, M16 CHROME
BRT Covert Comps 5.56, 6X, 7.62
11.5 CQB barrel. Did a barrel break in and zeroed it. Very smooth shooting!
Ran it with H buffer and standard spring in the back, FCD 6315 in the front.
Attachment 63406
Last edited by opngrnd; 08-13-20 at 11:11. Reason: Fix pictures, etc...
I have the 11.5” cqb barrel that I bought for 50/50 suppressed use. With an A5H2 buffer, unsuppressed, it would short stroke about every 3-4 rounds using 556 ammo (M193 and Black Hills RRLP). This was in 90 degree weather. I dropped down to an A5H0 and it runs good unsuppressed. I Have a Sandman S on it now and it runs very good suppressed.
I kinda wish the gas port was slightly larger so I could just run one buffer. The Sandman doesn’t add too much back pressure so I think I would have been fine with a standard port.
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