the correct designation for the snooperscope as mounted to the M2 car- bine was the M3. M1 carbine = semi-auto M2 carbine = selective fire M3 carbine = M2 w/ infrared scope i have TM 9-1276: Cal .30 Carbines M1, M1A1, M2 & M3; Feb '53, original at the office, but i'm heading to a swapmeet in a little bit; can pull the item when i return. tnx, barry carson city nv