Any buyers tips and pointers on M1 Carbines?
Don't, they are like Potato chips, can't stop with just 1.
But seriously, Inlands should be the least expensive.
Import markings like BLUE SKY, EXEL or CAI reduce collector value/cost.
Carbine ammo was never corrosive so most bores are good. Just make sure to gauge it. I have ME 3s that shoot pretty well.