My brother gave me this the other day, a 1911a1, there is no serial # on the frame, on the slide is SM m1911A1-67 Autoloading Pistol, Army Model, Caliber .45. On the other side of the slide is SM and then MGC in a logo type stamp. The barrel is either plugged or whatever, on the bottom of the main spring housing is stamped Japan. Is this a decommisioned gun or a replica? I have no other info about it. Here are some pics. Thanks.