Went to the range and finally put rounds through my ar pistol with a can on it. The bolt doesn’t lock back to rear on last round. I’m running 300 blk subs. Through a 8.5 “ barrel with a silencer Co omega can. I’m thinking the spring is to heavy. It will cycle the rounds just doesn’t go back far enough on last round to catch the follower part of the mag that holds it open after last round. Thus my reasoning about the spring being to heavy. Looking for input and help to fix issue.
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