That makes perfect sense to me RCS and Rick (who have both forgotten more about 1903's and 1903-A3's than I'll ever know)
The stock is clearly from a much later WWII era, 1903-A3. All of the markings on the stock are correct for a WWII 1903-A3, and NONE of the stamps are from the WWI era. NONE of the markings have any connection with the earlier 1903 that is in the newer stock now. The original WWII faded "FJA"[/B] inspection stamp is from when it was newly made in WWII, the other newer arsenal stamps on the left side are from later. As said, the pins in the stock are from a WWII 1903-A3. They only used pressed-in pins on the early WWII 1903-A3's. The original faded and circled 'P' is the original 'Proof' stamp from when the original 1943 1903-A3 was proof fired with a heavy load before it was passed on and accepted.
I know y'all all know this, but this I am trying to respond to 68GT390 so that he understands clearly that one of the stock's markings have anything to do with his rifle.…
ALL of the markings on this stock are from the history of the original WWII 1903-A3 that was in the original WWII 1903-A3 rifle, and have nothing at all to do with the early 1903 barrel/action that has been placed into this later WWII era 1903-A3 stock. The early 1903's will fit into 1903-A3 stocks, but the 1903-A3 stocks came out much, much later and have different characteristics. I feel the armories directed the later stocks to fit earlier 1903's just for logistical reasons. I have seen the 'box' Proof stamp on a few rebuilt M1carbines in the past, and I would tend to agree it is a rebuild 'proof' from at least later in WWII or most likely after WWII. (JMO)