You guys are looking at these old guns way too hard. They had a guy whose job was to look and measure stuff on these old military guns and to prove that he was doing his job he stamped the hell out of them whether he looked or not.... “What did you do in the war daddy?” “Well Timmy I stamped numbers and letters all over rifles and pistols so that 100 years from now collectors will be scratching their heads trying to figure out what a number two vs a letter c means.”