ABOUT CMMG MK57

With a few of the one of a kind projectiles I had helpful — most notably the large, fifty five grain subsonic rounds from Detroit Ammo Co (not pictured) — the bullet-shaped grooves within the front of your FN magazine didn’t Engage in nicely.Both ProMags I employed labored flawlessly, and the manufacturing unit 5-7 mag I'd didn't. I’ll conf