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Old January 27, 2013, 05:49 PM   #25
Jimro
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Join Date: October 18, 2006
Posts: 5,759
The "deep primer strikes" got me thinking that maybe someone had put in a 7.62x39 firing pin instead of a milspec firing pin. Hoever on an AR the firing pin protrusion can be changed by shaving the rear of the bolt (to increase protrusion).

Normally a deep pin strike would cause a failure to the impact site, not necessarily the sides of the primer. But I guess some blow by is to be expected, I've got a lot of old Mauser's with a perfect ring of scoring around the firing pin from blow by.

Jimro
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