The Great Plains Hunter 54 Cal. Percussion model features a fast, 1 in 32" shallow groove rifled barrel. It's ideal for shooting the many types of modern projectiles available to today's black powder hunter, such as heavier conical bullets and sabots. The Great Plains Hunter has all of the high quality features of the Classic Great Plains rifle. It is also pre-drilled and tapped for the optional 57 GPR receiver sight for the Great Plains rifle.