Abstract: A multi-caliber firearm has a breech sleeve connecting a barrel to a receiver and a stock. The stock includes a forward V-block and a rearward V-block. Each of the V-blocks defines a V-cut along a top portion and a through hole substantially aligned with the cross-sectional center of the V-block. The forward V-block extends through a cutout portion of the receiver and into the breech sleeve. The breech sleeve is fastened to the stock through the through hole in the forward V-block to provide a rigid connection between the stock and the breech sleeve. The receiver is fastened to the stock through the through hole in the rearward V-block to provide a rigid connection between the receiver and the stock.

Abstract: A muzzleloading firearm has a barrel with a bore on a bore axis, and the barrel has a muzzle end and a breech end. A frame is connected to the barrel, and has a breech face. The frame 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. A breech plug is removably attached to the barrel. The breech plug including a seal element closely received by the bore. The seal element may be a set of piston rings that are received in a circumferential groove about a forward end of the plug, or may be a cup at the forward end, with a forward rim that flares under pressure to provide a gas seal.

Abstract: A muzzle loading firearm with a break-open action includes a rear stock assembly and a barrel assembly. The barrel assembly includes an elongate barrel, having a bore with muzzle and breech ends, and a breech plug removably connected the breech end of the barrel, which encloses a chamber at the rear of the bore. The barrel assembly is pivotally attached to the rear stock assembly, and is movable with respect to the stock assembly between an open position in which the breech end is accessible for service, and a closed position in which the breech end is inaccessible and secured for discharge. A lever arm, optionally configured to serve as the firearm trigger guard, is user actuated for moving the action between the open and closed positions. The breech plug is configured for rapid removal from the barrel by hand when the action is open.

Abstract: A muzzleloading firearm has a barrel with a bore on a bore axis, and the barrel has a muzzle end and a breech end. A frame is connected to the barrel, and has a breech face. The frame 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. A breech plug is removably attached to the barrel. The breech plug including a seal element closely received by the bore. The seal element may be a set of piston rings that are received in a circumferential groove about a forward end of the plug, or may be a cup at the forward end, with a forward rim that flares under pressure to provide a gas seal.

Abstract: A muzzle loading firearm has a barrel with a bore on a bore axis, and the barrel has a muzzle end and a breech end. A frame is connected to the barrel, and has a breech face. The frame 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. A breech plug is removably attached to the barrel. The breech plug including a seal element closely received by the bore. The seal element may be a set of piston rings that are received in a circumferential groove about a forward end of the plug, or may be a cup at the forward end, with a forward rim that flares under pressure to provide a gas seal.

Abstract: A bolt action firearm includes a bolt assembly with a bolt body having an outer surface defining a longitudinal guide channel extending along a length of the bolt body from a rearward end to a forward end. A receiver defines a central longitudinally extending bore for accommodating the bolt body. A bolt guide is configured to be coupled to the receiver. The bolt guide includes a projection configured for traveling in the guide channel when moving the bolt body in the receiver so as to ensure that the bolt body is at a predetermined correct angular orientation within the receiver.

Abstract: A muzzle loading firearm with a break-open action includes a rear stock assembly and a barrel assembly. The barrel assembly includes an elongate barrel, having a bore with muzzle and breech ends, and a breech plug removably connected the breech end of the barrel, which encloses a chamber at the rear of the bore. The barrel assembly is pivotally attached to the rear stock assembly, and is movable with respect to the stock assembly between an open position in which the breech end is accessible for service, and a closed position in which the breech end is inaccessible and secured for discharge. A lever arm, optionally configured to serve as the firearm trigger guard, is user actuated for moving the action between the open and closed positions. The breech plug is configured for rapid removal from the barrel by hand when the action is open.

Abstract: A muzzle loading firearm has a barrel with a bore on a bore axis, and the barrel has a muzzle end and a breech end. A frame is connected to the barrel, and has a breech face. The frame 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. A breech plug is removably attached to the barrel. The breech plug including a seal element closely received by the bore. The seal element may be a set of piston rings that are received in a circumferential groove about a forward end of the plug, or may be a cup at the forward end, with a forward rim that flares under pressure to provide a gas seal.

Abstract: A muzzle loading firearm with a break-open action includes a rear stock assembly and a barrel assembly. The barrel assembly includes an elongate barrel, having a bore with muzzle and breech ends, and a breech plug removably connected the breech end of the barrel, which encloses a chamber at the rear of the bore. The barrel assembly is pivotally attached to the rear stock assembly, and is movable with respect to the stock assembly between an open position in which the breech end is accessible for service, and a closed position in which the breech end is inaccessible and secured for discharge. A lever arm, optionally configured to serve as the firearm trigger guard, is user actuated for moving the action between the open and closed positions. The breech plug is configured for rapid removal from the barrel by hand when the action is open.

Abstract: A muzzle loading firearm has a barrel with a bore on a bore axis, and the barrel has a muzzle end and a breech end. A frame is connected to the barrel, and has a breech face. The frame 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. A breech plug is removably attached to the barrel. The breech plug including a seal element closely received by the bore. The seal element may be a set of piston rings that are received in a circumferential groove about a forward end of the plug, or may be a cup at the forward end, with a forward rim that flares under pressure to provide a gas seal.

Abstract: A nozzle for lubricating an internally threaded rifle breech. The nozzle has a body containing a bore, with an inlet end adapted to receive a supply of lubricant. The body has an opposed end portion having a cylindrical wall and an enclosed free end. The cylindrical wall has a number of lubricant exit apertures. The body may be L-shaped, and the inlet may be threaded for connection to a lubricant container. The cylindrical wall of the end portion may have an external diameter less than an adjacent portion diameter, so that a shoulder is formed to limit insertion depth. A cap may be provided to cover the exit apertures so that the body may remain attached to the lubricant container.

Abstract: A muzzle loading firearm has an elongated barrel defining an elongated bore, with a muzzle end and a breech end. A breech cap is removably connected the breech end of the barrel to enclose a chamber at the rear of the bore. A portion of the breech cap may be external to the barrel, which may be externally threaded. The breech cap may be entirely clear of the breech bore, and the bore may have a consistent profile from end to end. The barrel threads may be standard, multistart or interrupted. The breech cap may overlay the face of the rear end of the barrel.

Abstract: A firearm magazine includes a housing defining a cavity. A resilient member is disposed in the cavity. A cartridge support member is movably supported on the resilient member and configured for moving downwardly into the cavity against increasing tension of the resilient member when the magazine is being loaded. The resilient member when under tension urges the cartridge support member and cartridges thereon to move upwardly during a feeding operation. An adapter converts a firearm magazine from multiple cartridge capacity to single cartridge capacity, and is configured to be removably coupled to the upper housing to cover the cartridge support member of the housing. The adapter includes an additional cartridge support member. The housing and the adapter cooperate to prevent the additional cartridge support member of the adapter from being moved downwardly into the cavity.

Abstract: A bolt action firearm includes a bolt assembly with a bolt body having an outer surface defining a longitudinal guide channel extending along a length of the bolt body from a rearward end to a forward end. A receiver defines a central longitudinally extending bore for accommodating the bolt body. A bolt guide is configured to be coupled to the receiver. The bolt guide includes a projection configured for traveling in the guide channel when moving the bolt body in the receiver so as to ensure that the bolt body is at a predetermined correct angular orientation within the receiver.

Abstract: A rifle stock has an elongated body with a forward end and a butt end. The upper and lower edges of the stock are solid and continuous from front to rear. A slot generally parallel to the butt plate is formed adjacent to the butt plate to allow limited flexing in response to recoil. The stock may be formed as a hollow shell with opposed side walls, with slots to find in each sidewall. Several parallel slots may be defined in each sidewall. The slots may be occupied by elastomeric elements.

Abstract: A muzzle loading firearm has a barrel with a bore on a bore axis, and has a muzzle end and a breech end. A frame is connected to the barrel, and has a breech face. The frame 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. A breech plug is removably attached to the barrel, and is connected to the barrel by way of interrupted, or multistart threads, or locking lugs. The breech plug may have a rear face that abuts the breech face when the frame is closed, so that a primer contained in a primer pocket in the rear of the breech plug is fully supported on all sides.

Abstract: A muzzle loading firearm has a barrel with a bore on a bore axis, and has a muzzle end and a breech end. A frame is connected to the barrel, and has a breech face. The frame 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. A breech plug is removably attached to the barrel, and is connected to the barrel by way of interrupted, or multistart threads, or locking lugs. The breech plug may have a rear face that abuts the breech face when the frame is closed, so that a primer contained in a primer pocket in the rear of the breech plug is fully supported on all sides.

Abstract: A muzzle loading firearm has a barrel with a bore defining a bore axis. The barrel has a muzzle end and a breech end, with a breech plug removably attached to the barrel and having a rear surface. An extractor is connected to the barrel and has a portion positioned rearward of the plug, and movable away from a position rearward of the plug, so that the plug may be removed without removing the extractor. The extractor may pivot, and may have a cylindrical portion received in a bore parallel to the barrel bore. The rear face of the extractor may be flush with the rear face of the breech plug.

Abstract: A firearm hammer has a hammer body with a hammer pivot axis for attachment to a firearm frame. A spur is connected to the hammer body, and the spur is movable among a number of positions with respect to the hammer body. The spur may be attached in a standard position in which it extends within the medial plane of the hammer body for use without a scope, or offset positions in which it angles away from the medial plane to provide accessibility. The offset angle may be 45 degrees, and a mating feature may provide the several attachment positions, each secure against movement except by deliberate removal of a fastener.