Get the most out of your Great Plains Rifle by adding an extra barrel. If you own a  great plains rifle with a classic 1:60" twist, you can aquire an optional "Hunter" barrel to shoot today's modern conical and sabot bullets, or you can change calibers. All Great Plains Rifles will accept .50 or .54 caliber barrels of the same ignition system. Ready to install. Comes with front and rear sights, ramrod thimbles, ramrod retaining spring, barrel rib and under lugs installed.