The M47 Dragon is an American shoulder-fired, man-portable anti-tank guided missile system, developed in 1975. It was phased out of U.S. military service in 2001, in favor of the newer FGM-148 Javelinsystem.
 
This is missing the computer system, in order to make it legal to own, however is vital to actually firing it, and will not be realistically accurate without it.