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#1




Round versus Square Proof
I have a stock that went thru the San Antonio Arsenal (CSSA) and it has both a P with a square around it on the bottom or the hand area and then another P further up on the hand area with a circle... Only one Arsenal Stamp... Are they both proof marks and do they mean anything different? Thanks so much!

#2




The P with the circle around it was the original proof stamp when the rifle was first assembled and test fired. The P with a square was when the rifle was proof fired after rebuild.

#3




Thanks for the explanation! Makes complete sense and now I know!!!

#4




Just to expound a little. Each depot had their own way of marking stocks that went through rebuilds. The P in a square are proof marks used by only two of them. San Antonino Arsenal and the Red River Arsenal.

#5




San Antonio put the proof on the heel of the grip while Red River put the proof on the grip.
Rob 
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