Patent ID: 7726058
Filing Date: 2010-06-01
Classification: F41C

Abstract:
1. A muzzleloader firearm comprising: a barrel having a breech end, a generally cylindrical bore and at least one lug retaining structure at the breech end of the bore, said lug retaining structure including an internal annular groove and an internal annular shoulder that is both adjacent the annular groove and positioned between the annular groove and the breech end of the barrel, wherein each annular shoulder is provided with lug entry cutouts; a breech plug having a shank portion that is sized to slidably enter the bore of said barrel at the breech end, said shank portion having an array of lugs that are spaced and sized to align with the lug entry cutouts in the barrel; and an ignition aperture, extending through the breech plug, configured to direct ignition gasses from a location outside the breech end to a combustion region within the breech end.