One time I reassembled my 84m and ran into this. What I found was that the mag box wasn’t seated into the receiver correctly. This created a binding of the action and did exactly what you ran into. Mine wasn’t loaded but coming off safe to fire would let the pin go every time.
Upon inspection, was able to see my error. Long way of saying u could check to see if your mag box isn’t binding or twisting the action. Pull the bolt back and stick your fingers in the magwell. Should be a little bit of wiggle room. If she’s tight, it’s likely contorting the action as u tightened the action screws. Just something to look at.
Last edited by tm7554; 12/14/23.
