The 2 issues we've seen:
1) The front pivot pin retaining spring needs to be trimmed about 1/3 of an inch as the hole is not deep enough in the original design. Not a biggy.
2) The bolt catch retaining screw cannot be tightened all the way or it binds the bolt catch. Adjust it out till the bolt catch moves freely and leave it. It won't back out.
JR
Sorry I have not put mine together but I have the DPMS LPK and it says nothing about a bolt catch retaining screw (maybe its there i just not sure). Do I have to purchase separately?