I think a P with a punch mark in the center of it means it was originally on a rifle and proof fired. A set of gauges would probably be the best indicator. Wish my local surplus stores had things like that.
Some have been reported as also wearing a T for "targeted." Some wear a DAS eagle with a punch mark in it. Some have a M and a punch mark nearby. Run a clean patch through it if you can. If the barrel's been shot the patch will pick up at least a little black carbon. The barrel proof marks on GI M14 barrels aren't as predictable as the ones on the M1 Garand.
You wanna get the best possible look at the chrome in the throat and up near the muzzle for flaking or visible spidering, cracks or burned-looking spots anywhere in the bbl. That's a reject. With a pulled barrel you wanna inspect the shoulder for rolling or peening or turning from the last install. That doesn't mean it WON'T index and headspace to your receiver. But it also doesn't mean it WILL. Pulled barrels can be expensive tomato stakes. OTOH, I know a guy who's bought several off GB cheap and managed to fit 2 to his builds on SAI receivers and sell a couple more to shooters who seem happy with them. So it's kind of a crapshoot. They were made to go as many as 10K rounds.
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