[Disco_Dante]

Did you ever dremel the little nub off the boltstop? Qlong has a tutorial where he shows which part to remove.


This fixed all the problem with my open bolt A1 not locking back.

I don't know how to link to a specific post so here's a quote:

Originally Posted by Qlong

This extra bit of metal pushes up against the wall of the upper and keeps the bolt catch from engaging fully. Only 1mm of the bolt catch face catches the bolt, eroding and smoothing the edge away.



I grinded the extra bit of this off and now the extra spacing inside the receiver allows the catch to engage fully.