I'll try a different rear sight aperture. I did not file down the NM aperture, it fit snug as is new. I just bought both of the rifles recently and have had them to the range 2 times. I can go to Tony Pucio at Orion 7, he is a local Garandicon expert. I would like to fix myself. It might be quicker and cheaper to have him take care of it. The irfles are not from CMPicon but that is where they originated from.
Thanks for the help, Ken