But I noticed I was having some light strike issues and rounds weren't cycling. Figured I'd just need to get it home and clean it. Moved back to 50 yards and got one shot off and the action locked up. Couldn't cycle the bolt back more than half-way and the trigger was completely locked. Took it down in the field and discovered what had gone wrong... The buffer tube retaining pin and spring had come out somehow and lodged in the trigger mechanism. Never seen that happen before. I had removed the brace to install a sling attachment plate, so I must have done something wrong when putting it back together. Had to take it home to get the spring and pin out and everything back together, so need to go back and verify it's working and finish sighting in. Anyone else had weird failures like that?