A break open rifle and bolt action rifle having a barrel extension with a breech end for receiving a propellant charge, a muzzle end with an extended attachment structure for receiving a complementary attachment structure of a barrel, and a chamber disposed within and through the barrel extension having a first diameter at a first end and a narrowing portion adjacent a second end opposite the first end, the narrowing portion having a second diameter smaller than the first diameter, wherein the first diameter of the chamber is sized to receive the propellant charge therein, and the second diameter of the narrowing portion is sized to prevent the propellant charge from being further inserted past the narrowing portion, and to prevent a projectile from being inserted through the chamber from the barrel muzzle end. A bolt action configuration having dual diameter non-rotating bolt with an extractor and ejector mechanism for removing a propellant charge.

A breech plug for inline muzzle loading firearms configured to use a blank powder cartridge loaded from the breech end, rather than powder loaded from the muzzle, and configured to place the projectile in substantially the same location in the barrel as if powder had been loaded from the muzzle end.

A breech plug for inline muzzle loading firearms configured to use a blank powder cartridge loaded from the breech end, rather than powder loaded from the muzzle, and configured to place the projectile in substantially the same location in the barrel as if powder had been loaded from the muzzle end.

A muzzleloader cartridge comprises a case having an open rear end, a forward end defining a vent hole, and sidewall defining a plurality of perforations. The case defines an interior space with a combustible liner lining the interior space; a first propellant received in the interior space; and a second propellent having a different characteristic received in the interior space rearward of the first propellent.

A force measuring device for a muzzle loader.

A muzzleloader firearm for use with a projectile, a propellant containment vessel including a prepackaged propellant charge therein, and a primer. The muzzleloader has a stock and a barrel supported by the stock. The barrel has a breech end, a muzzle end, and a barrel wall extending in a forward direction from the breech end to the muzzle end. A breech plug is at the breech end. The barrel being ported to transfer expanding gases from the barrel to the breech plug. A gas passageway in the breech plug directs expanding propellant gases to the propellant chamber behind the propellant vessel seated therein wherein the expanding gases can eject the used propellant vessel.

A muzzleloader firearm for use with a projectile, a propellant containment vessel including a prepackaged propellant charge therein, and a primer. The muzzleloader has a stock and a barrel supported by the stock. The barrel has a breech end, a muzzle end, and a barrel wall extending in a forward direction from the breech end to the muzzle end. A breech plug is at the breech end. The barrel being ported to transfer expanding gases from the barrel to the breech plug. A gas passageway in the breech plug directs expanding propellant gases to the propellant chamber behind the propellant vessel seated therein wherein the expanding gases can eject the used propellant vessel.

A muzzle loader AR upper receiver can include a muzzle loader AR pattern upper receiver configured to be coupled with an AR pattern lower receiver. The muzzle loader AR pattern upper receiver includes a body with a barrel opening. A muzzle loader barrel is coupled to the barrel opening of the muzzle loader AR pattern upper receiver. A muzzle loader AR rifle can include the muzzle loader AR pattern upper receiver and the AR pattern lower receiver coupled to the muzzle loader AR pattern upper receiver. A method of forming a muzzle loader rifle can include: providing a muzzle loader AR upper receiver; and coupling the muzzle loader AR upper receiver to an AR pattern lower receiver. A muzzle loader kit can include the muzzle loader AR pattern upper receiver and any other component, such as a ramrod, barrel, or AR pattern lower receiver.

A muzzle loader AR upper receiver can include a muzzle loader AR pattern upper receiver configured to be coupled with an AR pattern lower receiver. The muzzle loader AR pattern upper receiver includes a body with a barrel opening. A muzzle loader barrel is coupled to the barrel opening of the muzzle loader AR pattern upper receiver. A muzzle loader AR rifle can include the muzzle loader AR pattern upper receiver and the AR pattern lower receiver coupled to the muzzle loader AR pattern upper receiver. A method of forming a muzzle loader rifle can include: providing a muzzle loader AR upper receiver; and coupling the muzzle loader AR upper receiver to an AR pattern lower receiver. A muzzle loader kit can include the muzzle loader AR pattern upper receiver and any other component, such as a ramrod, barrel, or AR pattern lower receiver.

Muzzleloader systems including a pre-packaged propellant charge with a primer and receptacle. The muzzleloader system may include a propellant containment vessel separate from the primer and the projectile and that doesn't contact with the projectile until assembly. The muzzleloader may be rear loading, with a constriction portion forward of the breech chamber. The propellant containment vessel may include a body portion having a forward opening, with a propellant charge disposed therein and a cap portion that is crimp rolled within the mouth of the vessel to seal the forward opening. The closed end of the propellant containment vessel may define a primer receptacle configured to receive the primer. The receptacle may define a depth that is less than the primer height so that, when inserted into the receptacle, the primer extends rearwardly beyond the containment vessel. The muzzleloader system may be configured to fire only specifically configured propellant containment vessels.