Sorry to change the subject but bought an Iver Johnson about 6 or so months ago, and have fired at least a 1000 rounds thru it with out a hitch. I've used the new Korean 30 round mags as well as the "keep Shooting" mags, no U.S. government issued mags to date; and still no problems. In fact I just recently canned the birch wood stock and placed a walnut stock by Numerich, as well as a bayonet stud, with a bayonet, and the sling and oiler, not to mention the magazine pouch. Believe me I wouldn't have invested that much money if the carbine wasn't a shooter. BTW it is extremely accurate to boot.
To make a long story even longer, it is truly my US military M-1 Carbine, the only thing I did when I first got it, was I measured the recoil spring, and found it to be about a 1/2" shorter, so I replaced it with a brand new10.25" spring I purchased from Fulton Armory, before even attempting to fire it. Note I do reload ammo and while awaiting for the dies the brass and the bullets, I did a quite a bit of research before I even had a chance to fire it. Thus my superb little gem I call my IJ M-1 Carbine. Further I only paid $397.00 for it, in Prescott Arizona.