So I've been assembling an AR-pistol lower and everything is done except the pistol receiver and buffer spring assembly. I order the extension and receiver end plate from Rock River Arms, start to assemble and realize that the pistol receiver extension doesn't have a groove for the little tab on the end plate. It sort of makes sense since the extension doesn't require the castle nut, but how DOES it go together?
Do I need a special receiver end plate without a notch? Can I just file the tab off?
Do I need a special receiver end plate without a notch? Can I just file the tab off?