I have an Armalite A3 carry handle with A2 rear sights. It was advertised as having "National Match" rear apertures. Basically both holes on the flip sight are very small.
A while back I sort of messed up one of them by drilling it out to a larger hole. Didn't really work and now is ugly. I want to fix my silly mistake and replace with a standard A2 flip aperture. Not the whole assembly, just the L shaped thing.
Is it a matter of removing the screw on the side (It won't budge) or is there a special technique?