Hello all new to the forum and a very happy owner of the SP15 sport II, Decided to swap out the MagPul MBUS rear sight that came with the rifle with a Nikon P223 scope however I am having an issue trying to get the old rear sigh over the gun collar.
Everything else is standard on the rifle, is this just a matter of brute force which will more than likely scratch or damage the rifle collar or is there an process?
Thanks in advance
Mike