Re: m-2 carbine
it could very well be a m2 that has been modified to fire semi-auto only. or it could be a m1 with a m2 bolt . after the war these things were piled up and gone over. just like with the 45 autos parts were interchanged. thats why finding a all matching one brings higher dollars. m2's were easily converted back to a m1 configuration by removing a couple key parts.