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563 Posts
I just repaired a GC rear and installed a new front on a series 70. The factory never learned how to stake in an old Cup's front sight with the .055 tenon. The rear sights are very poor and I always suggest replacing them with a Millet rear sight. They make a drop in that will stay and works nice. A simple way to save the one you have is a drop of GREEN Loc-Tite ( sleeve retainer) on each end of the pin. Every Cup that came thru here had marks from some idiot trying to stake a pin. They are very hard to hit. Some of them have a crooked hole that makes the sight tip . Lets hope your's doesn't