Cabela's Investarms .54 Caliber Sidelock Percussion Muzzleloader Under Barrel Rib. Part is from a . 54 caliber muzzleloading rifle. Guaranteed to be genuine and original. Stock is in very good condition, no splits or cracks. 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. (A)