Anyone using any of the new BCM.....?

[1168]

I am also skeptical of the bias spring, but I’m struggling to come up with consistent data one way or another. If anyone here has a mag with consistent top-round stoppages with an A5, shoot me an IM.

[BufordTJustice]

I am also skeptical of the bias spring, but I’m struggling to come up with consistent data one way or another. If anyone here has a mag with consistent top-round stoppages with an A5, shoot me an IM.

I've only seen this one time. With an Anderson lower, IIRC.

The mag catch raceway was machined a couple thou too high in the lower. Resulted in the mag sitting higher than spec and excess upward pressure on the carrier from the round stack when fully loaded. Some mags were worse than others. Tried all A5 buffers. No fix.

What fixed that was a freaking RMA that resulted in a replacement lower being issued to that agency. The new lower was fully in spec and had zero issues.


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[17K]

Incorrect. The answer is: *nothing*.

There is zero guarantee of the position of the buffer weights within the buffer body without a biasing spring.


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That’s correct until recoil happens. Then the weights are stacked at the front of the buffer.

[BufordTJustice]

That’s correct until recoil happens. Then the weights are stacked at the front of the buffer.

There's no guarantee of that. There's no way to know that they haven't struck the front of the buffer and rebounded to a more rearward position.

If only a spring could be fitted to ensure that the weight stack remained at the front of the buffer.....


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[17K]

There's no guarantee of that. There's no way to know that they haven't struck the front of the buffer and rebounded to a more rearward position.

If only a spring could be fitted to ensure that the weight stack remained at the front of the buffer.....


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They only have to stay there for a few thousandths of a second. As long as the rifle is recoiling, the weights are at the front of the buffer.

[TBL65]

Attachment 69343

Forgive me if it’s been asked before but are there steel/tungsten weights inside the buffer weight body the same size as standard carbine buffer weights? Been considering the mk2/A5 system. Would be great to be able to play with weights without having to order multiple complete buffers
Thanks

[prepare]

Forgive me if it’s been asked before but are there steel/tungsten weights inside the buffer weight body the same size as standard carbine buffer weights? Been considering the mk2/A5 system. Would be great to be able to play with weights without having to order multiple complete buffers
Thanks

Dimensionally yes.

[Korgs130]

Any updates for the OP? I’m looking at getting a new 14.5” BCM upper and am curious if the BCM Comp Mod 3 would be much of a benefit over the A2X.

[royta]

I really wish BCM had a chart that compared each model to the A2 FH. Like this one is marginally louder to the shooter, significantly louder to the side, a wee bit better at flash hiding, noticeably less recoil. The way they have them described, I have no idea what I'm getting. They say they are quieter than other compensators. Okay, how does that compare to an A2? And which comps are they quieter than? Is the 0 quieter than the 1? Does the 6 decrease recoil more than the 2? It's anybody's guess. I guess I can buy them all and figure out which one I want?

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[ChattanoogaPhil]

Any updates for the OP? I’m looking at getting a new 14.5” BCM upper and am curious if the BCM Comp Mod 3 would be much of a benefit over the A2X.

I have a 14.5 ELW with a pinned Comp Mod3. Obviously I can't swap muzzle devices for direct comparison but my opinion is that if you're expecting much difference in felt recoil or muzzle rise compared to an A2 look elsewhere.

In regard to BCM 14.5... I'm considering BCM MK2 Recoil Mitigation System. Does anyone here use one with a BCM 14.5 midlength? If so, what have been your observations of reduced muzzle rise? Recommend buffer buffer choice (they offer four T0,1,2,4) for shooting M193,M855,IMI 77? General thoughts? Thanks.