A firearm has a frame and a barrel connected to the frame. An insert received by the barrel is separable into a rear position and a forward portion, and the rear portion is threadably engaged to the forward portion. Both the rear portion and the forward portion defining rifles bores.

A firearm has a frame and a barrel connected to the frame. An insert received by the barrel is separable into a rear position and a forward portion, and the rear portion is threadably engaged to the forward portion. Both the rear portion and the forward portion defining rifles bores.

A rotating bolt firearm may be configured to fire a .308 cartridge. However, the firearm may have a reduced weight in comparison to standard .308 rifles. The firearm may have many components typically used in a .223 rifle. The firearm may include a barrel extension with an extractor gap, which allows a .308 bolt to fit within a .223 sized barrel extension. The firearm may comprise an elongated magazine well in comparison to a .223 mil-spec rifle. The firearm may weigh less than 6.8 pounds with a 16 inch barrel, or less than 6.3 pounds with a 10.5 inch barrel.

A rotating bolt firearm may be configured to fire a .308 cartridge. However, the firearm may have a reduced weight in comparison to standard .308 rifles. The firearm may have many components typically used in a .223 rifle. The firearm may include a barrel extension with an extractor gap, which allows a .308 bolt to fit within a .223 sized barrel extension. The firearm may comprise an elongated magazine well in comparison to a .223 mil-spec rifle. The firearm may weigh less than 6.8 pounds with a 16 inch barrel, or less than 6.3 pounds with a 10.5 inch barrel.

A conversion kit (1) for converting a firearm to fire a plurality of different types of non-lethal training ammunition comprises a single barrel (2) and a plurality of interchangeable barrel liners (3) which can be used in place of each other. The barrel (2) defines a bore (4) which receives one of the barrel liners (3) for firing non-lethal training ammunition and each barrel liner (3) is specific for a type of non-lethal training ammunition.

A conversion kit (1) for converting a firearm to fire a plurality of different types of non-lethal training ammunition comprises a single barrel (2) and a plurality of interchangeable barrel liners (3) which can be used in place of each other. The barrel (2) defines a bore (4) which receives one of the barrel liners (3) for firing non-lethal training ammunition and each barrel liner (3) is specific for a type of non-lethal training ammunition.

An barrel (or barrel section) for a pneumatic gun can comprise a plurality of grooves and ridges arranged in parallel straight lines. The ridges may have a substantially arch-shaped cross-section with a rounded upper surface to provide minimal contact with a projectile such as a paintball being launched through the barrel. The grooves preferably provide channels to permit water and debris to be expelled from the barrel without interfering with the projectile travel. A plurality of apertures may be formed through a sidewall of the barrel along one or more of the grooves to further help expel water and debris, to impart spin to the projectile, and/or to improve a sound signature of the barrel.

An barrel (or barrel section) for a pneumatic gun can comprise a plurality of grooves and ridges arranged in parallel straight lines. The ridges may have a substantially arch-shaped cross-section with a rounded upper surface to provide minimal contact with a projectile such as a paintball being launched through the barrel. The grooves preferably provide channels to permit water and debris to be expelled from the barrel without interfering with the projectile travel. A plurality of apertures may be formed through a sidewall of the barrel along one or more of the grooves to further help expel water and debris, to impart spin to the projectile, and/or to improve a sound signature of the barrel.

The present invention relates to an arrangement for aligning a sub-calibre barrel (1) for use in a principal weapon barrel comprising i) an insert (4) arranged in said principal weapon barrel ii) front securing means (8) for aligning the sub-calibre barrel (1) iii) rear securing means for securing the rear end of the sub-calibre barrel (1), wherein iii.a) said rear securing means comprise a barrel nut (2) in which said sub-calibre barrel (1) is inserted; iii.b) clamping means (3a, 3b) securing said barrel nut (2) to said insert (4) and said clamping means (3a, 3b) in said principal weapon barrel. The invention also relates to a training weapon comprising the arrangement and a method of aligning the training weapon.

The present invention relates to an arrangement for aligning a sub-calibre barrel (1) for use in a principal weapon barrel comprising i) an insert (4) arranged in said principal weapon barrel ii) front securing means (8) for aligning the sub-calibre barrel (1) iii) rear securing means for securing the rear end of the sub-calibre barrel (1), wherein iii.a) said rear securing means comprise a barrel nut (2) in which said sub-calibre barrel (1) is inserted; iii.b) clamping means (3a, 3b) securing said barrel nut (2) to said insert (4) and said clamping means (3a, 3b) in said principal weapon barrel. The invention also relates to a training weapon comprising the arrangement and a method of aligning the training weapon.