I have a FX Impact m4 sniper the pic rail has a 20moa built into it. The scope I’m putting on it is a GPOTAC 6X 4.5-27 x50i PLRi it has a 34mm barrel the rings I have on hand are FX adjustable , Eagle Vision adjustable , Warne cantilever type w qr, Warne cantilever with 20moa and qr and probably...