I just ordered this upper Saturday and I want to change the gas block to a single rail.I don't want to just assume it is a .750 though. I won't be able to call RRA till Friday so I am hoping someone here knows the proper size.
AGP Arms, Inc. :: AGP Arms/AR-15 :: RRA Mid-Length Complete Upper with Quad Rail
RRA Mid-Length Complete Upper with Quad Rail
Built on a RRA A4 Flattop receiver
16" Wilson Barrel 1:9 .223/5.56 NATO
Lightweight Govenment Profile + A2 flash hider
Full Length Chrome Lined
Mid-Length gas system has less recoil than Carbine length systems
RRA Lightweight Freefloat Quad Rail
Front sight w/ bayonet lug and sling swivel
Complete with bolt carrier assembly and forged charging handle.
On some side notes this is my first time posting on this forms the only other firearms form I am active on is the unofficial P-64 forum but this seemed like a much better place to ask. Also, I just got done putting my first lower together and its going to be a long couple of days till I get my upper