Traditions Thunder Dome Breech Plug M8x1 Threads Not For Use With Pursuit Or Yukon Models. Must use the Thunder Nipples with the Thunder Dome Breech Plug. Fits bolt-action and in-line muzzleloaders. M8x1 threads. Cannot be used with Pursuit or Yukon Models. Specifications for Traditions Thunder Dome Breech Plug M8x1 Threads Not For Use With Pursuit Or Yukon Models A1403: Mfg Item Num: A1403 Type: BLACK POWDER GUNS - ACCESSORIES - TOOLS/PARTS Master Model Header: Thunder Dome Breech Plug Package Contents: Traditions Thunder Dome Breech Plug M8x1 Threads Not For Use With Pursuit Or Yukon Models A1403 The Traditions Thunder Dome Breech Plug M8x1 Threads Not For Use With Pursuit Or Yukon Models A1403 is a quality addition to the Traditions lineup. For more great deals on Gun Parts by Traditions please browse our Traditions Gun Parts page.