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Old May 25, 2010, 12:23 PM   #2
Senior Member
Join Date: June 9, 2002
Location: northern CA for a little while longer
Posts: 1,883
Have you checked it with the normal AR firing pin protrusion gauge?

Or are you looking for whatever the manufacturer of your particular rifle considers the 'optimal' protrusion instead of the typical Go/No-Go gauge results?

I'm not a gunsmith, but in the 4 armorer classes I've attended for the AR platform over the years (2 of which were Colt classes) it's never been discussed as being necessary to go beyond using the standard gauge to check protrusion.

I'd call the maker of your rifle and ask to speak with a tech or engineer, if you're interested in more specificity.
Retired LE - firearms instructor & armorer

Last edited by fastbolt; May 25, 2010 at 01:23 PM.
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