Patent ID: 7954269
Filing Date: 2011-06-07
Classification: F41C

Abstract:
1. A muzzle loading firearm, comprising: a barrel having a muzzle end and a longitudinal bore extending rearward from said muzzle end to a rear barrel portion with a breech plug chamber, said breech plug chamber having a rear end and an opposing forward end, an internally threaded engagement portion adjacent said rear end and an initial portion forward from said internally threaded engagement portion; and a breech plug having a one-piece, integral body with an outer peripheral surface and adapted to be received in said breech plug chamber, said breech plug body having a nose facing said longitudinal bore, a breech end opposite said nose, a cup element adjacent said nose and a threaded engagement portion adjacent said breech end, said threaded engagement portion engaging said internally threaded engagement portion of said breech plug chamber, said cup element being a deformable seal element in the shape of a circular wall, said deformable seal element being compressed from a first position having a first outside diameter to a second position having a second outside diameter when said breech plug is secured in said breech plug chamber, said second outside diameter being less than said first outside diameter and substantially coextensive with a diameter of said initial portion, to thereby form a gas seal to prevent fouling of said threaded engagement portion during firing.