It is the bolt smacking the trunnion and transfering the "ding"..
Consider re-evaluating you actual headspace so the bolt is held back some 10 - 15 thousandths with a sized primerless case in the chamber and bolt closed..
That is how I run my M11 SMG and my SBR Uzi.. only time my bolt hits trunnion is on empty chamber.
It is the bolt smacking the trunnion and transfering the "ding"..
Consider re-evaluating you actual headspace so the bolt is held back some 10 - 15 thousandths with a sized primerless case in the chamber and bolt closed..
That is how I run my M11 SMG and my SBR Uzi.. only time my bolt hits trunnion is on empty chamber.
capttoyota 1 year ago