Check the listing for details. Knight Disc Inline Muzzleloader Bolt Stop Screw. Condition: Used, Made in United States. Listed at 29.99 USD. The Knight Disc .50 cal. Muzzleloader parts are vintage gun parts designed specifically for Knight Disc. Made in the United States by Knight, these parts are a perfect fit for collectors and enthusiasts of black powder hunting. With a classic design and no modifications, these parts offer a timeless and authentic look for your muzzleloader firearm. Bolt Stop Screw is in good condition, as shown. Includes all shown. Please examine all the photos and if you have any questions about the listed item or need additional photos of a specific area of the listing, contact us. We try to make accurate listings, but please let us know if something could be more accurate or precise. Seller assumes no liabilities. Know your local laws and use a licensed gunsmith.