M1 Lifespan?

[P5 Guy]

M1 in my safe is wearing a 1947 barrel installed during Repair and Refit post WWII.
Where it went after that, who knows? I bought it from the CMP about ten-twelve years ago. I have fired this rifle maybe 2k rounds, or more, slow fire. The TE and MW have not changed since the CMP gauged them. TE=3, MW=2.5.
Careful maintenance the barrel should last thousands of "SLOW FIRE" rounds. Too many mad minutes will take it's toll.

 

[MythBuster]

FlyinBryan said,
"when i was at the south store i talked to a man whos son shot all the cmp matches and the j.c.g. matches and said he had a match rifle with 15000 rounds on it and he had not seen a decrease in accuracy"

That would depend on how good was was. A High Master class shooter would know the difference.