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Put 29 rounds through a new BCM upper (Session ender test) and I could swear the recoil felt stronger than my beater-Bushy 1/7. Both are 14.5 M4 profile. BM has a Colt BCG, and BCM has a BCM.
Used on the same lower with a standard spring and H2. No short stroking and both lock back perfectly.
The BCM just seems to have a stronger kick with an extra boing feel after each shot.
Any ideas?
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