I have a gun that I am attempting to determine if it is an original or a replica. It's in awesome shape, regardless, but I know there is alot of difference. The gun I have says on the breech: Thompson Semi Automatic Carbine Caliber 45 Automatic cartridge Model of 1927 A 1 Serial # 5A21 On the opposite side of the breech it says: Auto Ordnance Corp. West Hurley, New York and has the following patent #'s 1,131,319 1,338,866 1,340,891 1,340,943 1,347,754 1,349,345 1,352,414 1,357,208 1,363,809 1,403,623 1,406,546 1,408,976. Can anyone enlighten me? Thanks