A SECRET WEAPON FOR CMMG MK57

With a number of the exclusive projectiles I'd handy — most notably the large, 55 grain subsonic rounds from Detroit Ammo Co (not pictured) — the bullet-formed grooves during the front from the FN journal didn’t Engage in nicely.Each ProMags I employed labored flawlessly, and the factory Five-seveN mag I had did not. I’ll confess my standar