A firearm training barrel for a replica gun, the gun having a slide, a magazine configured to store pellets, and a nozzle. The barrel includes a pellet ejecting mechanism to eject pellets loaded in the magazine thereby simulating the ejection of a casing/shell.

A firearm training barrel for a replica gun, the gun having a slide, a magazine configured to store pellets, and a nozzle. The barrel includes a pellet ejecting mechanism to eject pellets loaded in the magazine thereby simulating the ejection of a casing/shell.

A firearm for firing cased telescoped (CT) ammunition cartridges that includes a split chamber configured to fully support a CT cartridge when it is fired, and that includes i) a dynamic rear chamber portion defining a pocket in a face of a bolt, and ii) a static front chamber portion that is integral to the barrel and separate from the bolt. A cartridge extraction mechanism engages the CT cartridge prior to the CT cartridge being fired, and holds the CT cartridge in the pocket in the bolt face as the bolt moves rearward to pull the CT cartridge out of the static front chamber portion and into an ejection position. An ejector is operable to eject the CT cartridge from the pocket in the face of the bolt when the CT cartridge reaches the ejection position.

A firearm for firing case-telescoped (CT) rounds includes a barrel configured for transit of a bullet of a live CT cartridge in a live-fire operating mode. The live CT cartridge is chambered and fired from a live-fire chamber installed in the live-fire operating mode. The firearm further includes a blank-fire chamber configured to chamber and fire a blank CT cartridge in a blank-fire operating mode, wherein the blank-fire chamber has a second diameter less than a first diameter of the live-fire chamber, to prevent chambering of the live CT cartridge in the blank-fire operating mode. The arrangement can enhance safety by preventing accidental firing of a live round during operation when it is assumed that only blanks are being fired.

System for a multi-caliber self-loading action. Specifically, the system is comprised of a multi-position locking assembly and a self-regulating gas assembly. The multi-position locking assembly is comprised of a bolt carrier, a spring, a bolt, a lock, and a cam assembly. The cam assembly will interface between the bolt carrier and the bolt to rotate the bolt through the bolt carrier. The lock will interface with the bolt, to lock the bolt in at least one locked position based on the caliber of the round inserted. The self-regulating gas assembly directs gas from the gas regulation to at least one piston cup, which will then cause the piston to act on the multi-position locking assembly.

A gun barrel that has a proximal chamber end, a distal muzzle end, and an internal bore bounded by a bore wall, the internal bore having a first rifled bore section proximate to the proximal chamber end of the barrel, a second rifled bore section at the distal muzzle end of the barrel, and a reducing section distal to the first rifled bore section and connecting the first rifled bore section and the second rifled bore section, wherein at least one of the first rifled bore section and the second rifled bore section have straight groove rifling.

A gun barrel that has a proximal chamber end, a distal muzzle end, and an internal bore bounded by a bore wall, the internal bore having a first rifled bore section proximate to the proximal chamber end of the barrel, a second rifled bore section at the distal muzzle end of the barrel, and a reducing section distal to the first rifled bore section and connecting the first rifled bore section and the second rifled bore section, wherein at least one of the first rifled bore section and the second rifled bore section have straight groove rifling.

Some embodiments may include a barrel for a firearm, the barrel having a bore extending from a breech end of the barrel to a muzzle end of the barrel, the back of the bore comprising a chamber of the barrel, the barrel further comprising: barrel face on the breech end of the barrel; and a recess on the barrel face, the recess having a bottom that extends from the chamber of the barrel to an exterior side surface of the barrel. Other embodiments may be disclosed and/or claimed.

Some embodiments may include a barrel for a firearm, the barrel having a bore extending from a breech end of the barrel to a muzzle end of the barrel, the back of the bore comprising a chamber of the barrel, the barrel further comprising: barrel face on the breech end of the barrel; and a recess on the barrel face, the recess having a bottom that extends from the chamber of the barrel to an exterior side surface of the barrel. Other embodiments may be disclosed and/or claimed.

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.