M1A1 Paratrooper Carbine. cal .30 carbine. Over 6 million M-1 carbines were made for the U.S. Army until 1945. Not to be confused with the M-1 rifle. The carbine is much lighter and shorter, and uses different, lower power ammunition. 15 and later 30-round magazines. This is the paratroop version, with folding stock.