Traditions Buckskinner Sidelock .50 Cal. Muzzleloader 21" SS Barrel Without Nipple with 1:20 Twist- 15/16" Channel. Octagon to round barrel. Part is from a Traditionals Model Buckskinner Sidelock .50 caliber muzzleloading rifle. Guaranteed to be genuine and original. Barrel is in good condition, as shown. Photos are of the actual item you will receive. Please, examine the photos and if you have any questions about the listing or need additional photos, contact me. Seller assumes no liabilities. Know your local laws and use a licensed gunsmith.