Re: AR-15 sight question
I own a RRA with a front flip up sight. The sight is integrated with the gas block and cannot be removed without also removing the gas block. As stated earlier, the gas block is not pinned to the receiver, but rather is clamped on with screws. The flip up front sight will not obstruct any optics because when it folds down, it folds below the profile of the rail, so as you are looking down the rail, all you see is flat top when the front sight is folded down. Hope this helps!