You said that after you tightened the nut the gauge with the tape on it would not allow the bolt to close. Will it close on the gauge without the tape?
Firing pin: A 49 and 51 drill bit diameters are .073 and .067 respectively. What is the diameter of the firing pin at the hole?
The firing pins are .095 and .145 in the area where they pass through the cross pin. This was changed to increase strength and eliminate cross pin failures.
You can Gun Kote the bolt body. Do your prep right. I have seen limited success doing this with their gear kote.
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