Have had this out to the range a couple times now and it seems something goes wrong with it every time. After fixing the buffer/spring problem shots were all over the place, double checked the scope/mount tightness and it was fine. Took it back out again Friday night and the bolt catch broke. Decided to keep shooting it since it doesn't affect function. Ended up getting brass in the bolt some how and locked it up. Was able to get it apart when I got home, cleaned, and inspected it. I didn't find anything else wrong with it. I'll have to get a new bolt catch and see what goes wrong next...