Abstract: A muzzle loading firearm has a firing mechanism including a barrel having a breech end and a center bore case located over the insert. The breech plug and insert together define a bore to allow a flame from an ignited primer on a cartridge casing to travel to a projectile propellant at the breech end of the barrel and otherwise provide a seal between the receiver and the barrel. A substantially cylindrical bolt without conventional radially projecting lugs is recipricatable and partially rotatable within the receiver between an open position and a closed position in which an end of a bolt can compressibly engage against an ignition casing. A pin extends through a wall of the receiver engaging a camming groove in the bolt to guide the bolt and to lock the bolt against a primer end of an ignition casing when an ignition cartridge is loaded into the receiver.

Abstract: A muzzle loading firearm includes a barrel, a receiver, and a breech plug located at the breech end of the barrel. An insert integral with or attached to the breech plug provides sealing engagement against an opening in a cartridge case. The breech plug and insert together define a bore to allow a flame from an ignited primer on a cartridge casing to travel to a projectile propellant at the breech end of the barrel. A bolt without conventional lugs is movable within the receiver between an open position and a closed position. A pin extends through the receiver engaging a camming groove in the bolt to guide and lock the bolt against a primer end of an ignition casing. The camming groove and metal pin are configured to compress a face of the ignition cartridge against the breech plug when the bolt is in the closed position.

Abstract: An adaptor (10) which allows a standard cartridge firing action to be used with a muzzle loading firearm (100) is described. The adaptor includes a breech plug (12) and a nipple (16) and is configured to be inserted into the barrel (108) of the firearm adjacent the receiver (104). The breech end (16A) of the nipple (16) has a conical shape. In use, a standard ignition cartridge (150) with a casing (150A) and a head (150B) with a primer (154) mounted in the flash hole (152) in the head is loaded into the receiver of the firearm. Next, the ignition cartridge is moved into the breech end (108A) of the barrel such that the casing extends into the center bore (14) of the breech plug and the breech end of the nipple extends into the end (152B of the flash hole in the head of the cartridge and is adjacent the primer. When the firearm is fired, the firing pin (114A) contacts the primer which ignites the primer.

Abstract: An adaptor (10) which allows a standard cartridge firing action to be used with a black powder muzzle loading gun (100) is described. The adaptor includes an insert (12) and a nipple (16) and is configured to be inserted into the barrel (108) of the gun adjacent the receiver (104). In use, a standard rifle cartridge casing (150) with a wall (150A) and with a head (150B) at one end containing a primer (152) is loaded into the receiver of the gun. Next, the cartridge casing is moved into the end (108A) of the barrel such that the casing extends into the center bore (14) of the insert and the nipple extends into the inside of the casing. When the gun is fired, the firing pin (114A) contacts the primer which ignites the black powder (118) which expels the projectile (120) from the gun. The ignition of the primer causes the wall of the casing of the cartridge to expand. The casing expands such that the casing is force fit and tightly held in the center bore of the insert.