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I see numerous interesting markings and variation in many barrels and bolts. It is very interesting and I want to know more.
 

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Pg. 285 in the book Full Circle gives a generalization of some of the *stampings and what they are. I've searched about the markings on the back of the bolt carrier a few years ago but never came up with anything. I would have to assume they are acceptance stamps stating that it met standards. Whether each person, dept. or location had their own stamp...I don't know; would be interesting if this info existed.

*
Model
Serial number
Month and Year of manufacture
Makers initials or logo
Acceptance stamp
Proof mark

Muffler
 
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