I thought I wanted one of these too. Then I spent a few days researching and talking with some guys that know guys pretty well. They talked me out of it.
First to find one in really good condition is tough and expensive. And second, the round is not very powerful, a 5.56 is much better. And I just went to a couple of M1 Carbine sites to pass along to you and both were off line. Not a good omen.