The Winchester Repeating Arms Company's first product, the Yellow Boy. An improved Henry rifle with a closed magazine and wooden forestock, the 1866 defined the Winchester lever-action platform that would dominate American rifle sales for decades. Type: Rifle Action: Lever-Action Caliber: .44 Henry Rimfire Capacity: 17 Year introduced: 1866, USA Weight: 9 oz Overall length: 43.5" Status: Discontinued Intended use: Frontier, Collecting