I have a line on an Inland M2 that appears to be an overstamp. I thought I was looking at a GI gun but the Form 4 has Rock Island Geneseo, IL as the manufacturer. I know this outfit is a commercial cousin of Springfield Armory, Inc. and did M2 conversions in the 80's. Can anyone out there tell me RI did to these guns? Were they taking surplus M2's and registering/selling them or were they taking surplus M1s and converting them/overstamping them? Any other general information would be greatly appreciated...can't find much out there.