Replacement breech plugs are the same reliable designs and quality that come standard with all CVA rifles. This Breech plug is for most all Conventional In-Lines & Bolt-Action Muzzleloaders. This includes the following models-Buckhorn-Eclipse-Eclipse Hunter-Stag Horn-Magbolt 150-Firebolt- Firebolt Ultramag-Hunterbolt-Magnum Hunter.