M55302/1-05 is a Winchester Model 55 outer magazine tube assembly, designed to fit Winchester 55 lever action rifles chambered in .22 short, long, and long rifle. It is made of steel, with a black finish, and comes complete with a spring, follower, and end cap. This part is necessary for the functioning of the rifle, as it holds the cartridges within the magazine tube, and feeds them into the receiver to be chambered.