The Winchester Model 1866, also known as the "Yellow Boy", is an iconic lever-action repeating rifle introduced by the Winchester Repeating Arms Company in 1866. Named after its distinctive gunmetal (bronze/brass alloy) receiver, the Model 1866 was a revolutionary firearm, being one of the first lever-action rifles to utilize brass cartridges, which greatly reduced weight and enhanced efficiency. The Model 1866 was produced in two primary variants: a rifle and a carbine, both designed to be more compact and lightweight, making them ideal for hunters and long-distance travelers. Weighing only 8 lbs, the Model 1866 was much lighter than other rifles of its era, providing mobility without sacrificing power or accuracy. The Winchester Model 1866 featured a 20" or 24" barrel with an effective cooling mechanism, allowing the rifle to fire continuously without accuracy degradation from overheating. Its tubular magazine could hold 14 rounds, enabling rapid fire. With an effective range of 200 yards, the Model 1866 was well-suited for both short-range and long-range hunting. The rifle's half-cock safety mechanism reflected its design for experienced shooters, allowing it to be ready to fire at any moment. The American walnut stock, crescent butt plate, and steel furniture further enhanced its durability and aesthetic appeal. This combination of power, precision, and ease of handling solidified the Winchester Model 1866 as a legendary firearm for hunters and collectors alike.