I've got an early M&P made by STAG. I just switched from an H buffer(put that in my middy) and got a RRA 9mm buffer. Shoots very smooth with hardly any muzzle rise. I ran about 200 rounds of Wolf 55gr through it a few weeks ago in 20 degree weather and everything functioned fine. I've had the H buffer in it for about 3 years without any problems also. I would bet the OP just had an isolated problem round. The H2 should be fine with the semi auto carrier. David


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