i have a bm  and the only probs ive had with it have been with the bm fac mag.  what a piece of shit.  all my other mags parsons adv line sanchez etc.  ive had no prob out of.  in lighter subjects in the military ive found it wanst the gun or the mag it was operator head space and timing.  ie dirty weapon. unseated mag.  not using forward assist.  weak mag springs weak mag release springs.  and pvt pile doing such things as using his weapon for a pry bar.  so clean your weapon real good do function checks and routine maint.  fix broken or worn parts.

oopps should have been a new post not a topic. so solly gi