On the note of that trigger weight adjustment screw… I just took mine out to see how low I could get my trigger. After re-assembly and putting the skins back on the trigger worked normally once, when I cocked to check again it locked up and the safety wouldn’t engage. Tore the skins off again, put some locktight on the screw and threaded it in just enough to stay put. Now everything works fine again. Not sure if it’s just my trigger but I would advise against removing the screw completely on an A2/M2 trigger. I remember years ago reading that it wouldn’t matter on an A1 trigger, but it’s a very different design.