LITTLE KNOWN FACTS ABOUT CMMG MK57.

In the event the bolt carrier moves forward, the bolt rotates and locks the lugs before the supporting lug abutments. When the group moves rearward, the cam pin forces the bolt to rotate and unlock from the barrel extension.Absent through the bolt carrier group (BCG) is a fuel critical, which is normally discovered on DI-­kind, AR-­pattern firear