Hi all, I just got my first M1A, a Springfield Armory Loaded, synthetic stock. I love it! However, the rear sight aperture is loose and wobbles quite a bit, even with both the windage and elevation screws tightened down. This doesn't seem normal. Any hints on whether I should disassemble it and look for missing parts/springs? Or do I just not have the screws on both sides tightened down enough? (I tried to be gentle, as I do not know how much abuse they can take).