A Colt-manufactured conversion unit converts Government Models to a Colt .22 LR 10 Round Target pistol with Accro adjustable sights and a floating chamber to simulate .45ACP recoil. The idea was to provide an economical means to practice with the .45ACP. The unit has everything you need to make the conversion. A downloaded copy of a Colt instruction manual is included. I don't have the original box, but if I did, they would be selling for twice the price. Check out SimpsonLtd.com. That's a lot of money for cardboard! The unit is in excellent condition. Close-up photos show lint from wiping it down. Bluing is perfect.