I have a photograph of my father in WWII, holding an M1 Carbine. He was a heavy machine operator for the IX Engineer Command, and working behind, but close to the front, he was issued an M1 Carbine.
Like so many veterans, he almost never talked about the time he spent in the war, so I don't know if he ever shot that M1 at the enemy. My best guess would be that he didn't. His job was building landing strips in newly freed territory, to bring supplies in, and take the wounded out.
The M1 Carbine was a very successful design, with a very short lead up, between concept and production. I'm sure a LOT of soldiers were happy to have them, compared to the Colt 45ACP's they probably would have been issued, if the M1 wasn't available.
I've always wanted to own a nice 'shooter grade' M1 Carbine, but I lack the knowledge to know if I would be buying a 'good one', or not.
I wouldn't mind paying a fair price. I need to find somebody like the OP, to buy his 'project gun' from.