The 1866 Winchester Yellowboy replica in .45 Colt. The original 1866 introduced the brass receiver that earned the "Yellowboy" nickname — the first truly refined Winchester lever-action after the Henry Rifle. Uberti's replica features a polished brass receiver, walnut stock, and a king-pin loading gate on the right side of the receiver. Type: Rifle Action: Lever-Action Caliber: .45 Colt Capacity: 13 Year introduced: 1966, Italy Weight: 8 oz Overall length: 43" Status: Active Intended use: cowboy_action, collector, historical