That is actually the barrel flat or flats. The water table would be the flat part of the receiver that mates up to the barrel flats. Typically there you will find additional markings that can be helpful to you in determining what you have. I'm with you on that D stamp and what ever that is. Someone here will most likely know but not me. Good luck !
Quote:
Originally Posted by Kenn Hogentogler
I thought this was the watertable?
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