The Traditions Thunder Dome Breech Plug provides you with one of the fastest, most reliable ignitions in muzzleloading today! The deep concave fire channel positions the ignition flame directly at the Pyrodex Pellet or loose powder. This two-part system must be used with the Thunder Nipples. Fits most Traditions bolt actions and Tracker models. Does not fit break-action models. FeaturesFastest, most reliable ignition systemSends ignition flame directly to powderFits most Traditions bolt actions and Tracker models