I've had a pristine Rock Island Armory rebuild 1943 NPM M1 Carbine for almost 40 years and have shot it very little to keep it in great shape. It's got the upgraded sights, safety, and bayo lug but has a 'high wood' stock and original Marlin barrel with a muzzle that's just over a 1. Recently, it was valued by a M1 Carbine dealer here locally at $1,200 - $1,400 dollars.
Anyway, I've been looking for one to use as a shooter for a while and couldn't find anything in the $600 - $700 range that's wasn't a worn out beater with a shot out barrel. So, I took a chance on a NIB Auto Ordnance M1 Carbine recently at Bud's for $628 delivered and after over 400 rds I'm relieved to say that it's a good shooter with no feeding issues at all. As a bonus, it turns out to be very accurate for a carbine too with one of our younger CMP shooters achieving a couple of 2" groups at 100 yds with it. (My 64+ yr old eyes just won't let me shoot that well and my best groups are in the 4+" range at 100 yds with it.)