Yikes. I must have lucked out. I bought mine in May (can't determine build date) and have no issues after at least 1000 rounds. Removed easily and never budges. Just doesn't seem to make sense that they can't nail this down. Is it dangerous for us to start logging serial numbers here of problem/no problem pieces? This video says a split lock washer does the trick with an occasional cleaning of screw and threads with rubbing alcohol.