Muzzle loading firearm

A muzzle loading firearm comprising:

• a firearm barrel having a breech region through which there is an opening running from exterior to interior of the barrel, and the interior wall of at least an outer end region of said opening being threaded;
• an elongated tube having:
• said tube terminating in a plane surface at one end adjacent to said first end region, which plane surface lies generally normal to the direction of said opening, and
• first and second ends of said tube being threaded, and said first end being adapted to mate with said interior threaded opening in said barrel;
• a cup having a protrusion on its inner end surface and having inner side wall threads adapted to loosely thread over said second end of said elongated tube;
• a shot shell primer comprising:
• a tubular body having an outer diameter corresponding to the inner diameter of said first end region of said elongated tube,
• an explosive charge contained within said tubular body,
• a generally flat, circular end member closing one end of said tubular body and extending radially outward from said tubular body to form a flange, and said end member including a central membrane adapted to communicate a firing force to said explosive charge when struck, and
• said tubular body is positioned within said first end region of said elongated tube with said flange resting against said plane surface of said elongated tube;
• and
• spring loaded hammer means supported by said barrel for applying a small area force to said central membrane of said shot shell primer;
• whereby, when operated, said hammer means provides a force which is communicated through said cup to said membrane to ignite said explosive charge within said elongated tube, which tube in turn effectively provides a single exit path for the ignited explosive to the interior of the breech of the barrel, enabling a projectile propellant therein to be reliably fired.