The "A23" is the barrel steel lot code; the P on the barrel indicates that the barrel passed a firing proof test.
On the left side of the stock, I can read the AAQ (Augusta Arsenal) - but can't make out the stamp above.
The stock is probably a Springfield or Rock Island one. If the top inspection stamp on the left side of the stock is an RLB, it is an early Remington stock and worth some beaucoup bucks.
For the record, the original stock would have been a FJA-stamped stock with stock pins and no handguard retaining ring "slots" near the receiver.