This is something I think you really need someone with good information on the M1 Carbine to look at. Unless you get it for a couple hundred dollars I think it needs be field disassembled. Is it an import ? Is it 100% USGI ? Do the parts match ? I have never been impressed with the 30 round magazines as there are a number of posts about jamming. Fake coolapsable stocks also seem previlant. A couple to a few hundred dollars might be a decent buy. Serious money needs some real careful examination. You might visit the CMP forum to get informed.
When the number of people in institutions reaches 51%, we change sides.