Muzzleloading rifle with breech plug having primer seal facility

摘要

A firearm having a barrel with a bore on a bore axis, with the barrel having a muzzle end and a breech end. A frame is connected to the barrel and has a breech face. The barrel moves between an open position in which the breech face is away from the breech end of the barrel and a closed position in which the breech face abuts the breech end of the barrel and/or the breech plug's rear face. A breech plug is removably attached to the barrel. The breech plug includes a central passage that communicates between the primer and the flash hole. The passage forms a primer pocket at the breech end of the breech plug. The primer pocket has a diameter greater than the central passage. A circumferential groove in the primer pocket receives an O-ring. The O-ring encompasses the primer's cylindrical exterior to create a seal.