I only have 570 rounds through my BCM 14.5" mid-length upper so far, 150 of those rounds were fired with my surefire suppressor attached, and I haven't had a single issue.
Ammo used was 370 rounds of Hornady 55gr Training ammo, and 200 rounds of PMC 55gr.
Thing is, I just now went and checked to see what weight buffer I had in there because I couldn't remember right off hand, and this ENTIRE time I've been using an H2 buffer by mistake. I thought it was a carbine or H1 this whole timeGuess I'll just go ahead and keep it in there for now.
Anyhow, this upper is one smooth shooting bitch, that's for sure.


Guess I'll just go ahead and keep it in there for now.
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