IBM Corp M1 .30 Carbine caliber carbine. 1943 dated M-1 carbine sniper. This is a rare model variation with the early lower mount for the infrared below the stock. This was decided to be an inferior mount as it was too low. The Army then decided to send out a kit so you could attach an infrared unit on the top of the scope as are all of the later infrared snipers. Gun is about excellent with a 1943 dated IBM barrel. Very scarce rig with both infrared units.