Serial # 56951, 50 caliber percussion, 220 inch barrel, bright excellent bore. This late production White Mountain Carbine features Fire Sights, single trigger, half octagon barrel, and rubber butt pad. It remains in very good used condition with a few small scratches on metal and stock. It shoots well and is similar to the one I use. These have a 1 in 48 twist and work well with round balls, sabots or heavy bullets. Free shipping.