Just curious. Are you saying it can't be bolt bounce? I had the exact same thing happen with some of our Bushmasters. I replaced every single part in the lower receiver (trigger, hammer, disconnector/spring) as well as the buffer spring.
I even tried different lowers in order to narrow it down. In every single case it continued to happen. I then replaced the barrel with a brand new 14.5" BM barrel and reinstalled the original parts into the weapon. The issue was gone. I fired approx. 10 magazines through it to check it and it worked 100%.
I'm not saying it can't be something else and I believe that I stated he should try other steps.



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