Re:BB serialization
I agree, all the matching military PO8 that I've seen do have the last two digits of the serial on the left side just below the test eagle. Commerical will usually have a crown over N, either in this location or on the left side of the mid link. Commerical BBs with also have an assembly (not same as s/n) number on the back, usually to the left of the firing pin retainer.
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