A training pistol having a rigid barrel and operating with a conventional blowback system, including a frame, a slide and a barrel, including a slide stop device, a firing pin assembly and preferably including a slide lock which can be moved into a disassembly position in which it releases the movement of the slide toward the front. This release can only be achieved if there is no magazine in the magazine well of the frame and the slide is stopped. The barrel is fastened in the frame by a locking device that can be brought into a release position in which it releases the barrel. Additionally an unlocking gap is provided between the barrel and the slide, and when the gap is overcome, after the slide lock has moved into the disassembly position, an unlocking ramp provided on the slide forces the locking device into the release position.

The invention relates to quick acting interfaces that allow for easier transportation and maintenance of precision rifles. Embodiments include an interface with an engaging segment and a receiving segment that engage one another and lock together. The engaging segment may have a series of connective bearings that fit into indentations inside the receiving segment. Embodiments allow a firearm to be modulated such that a barrel of the firearm may be disassembled without the need of any specialized equipment and reassembled without impacting the firearm's accuracy or reliability. Embodiments are scalable such that multiple interfaces can be used to adjust the total length of the firearm barrel.

A firearm includes a quick-change barrel including: (a) at least two barrel-mounting features, each configured to selectively interact with a barrel-receipt feature of the firearm during mounting of the quick-change barrel to a mounting structure of the firearm, or (b) at least one barrel-mounting feature configured to selectively interact with at least two barrel-receipt features of the firearm during mounting of the quick-change barrel to a mounting structure of the firearm. The barrel is selectively mountable to the firearm in at least two orientations depending, per (a), upon which of the at least two barrel-mounting features interact with the barrel-receipt feature or, per (b), upon which of the at least two barrel-receipt fixtures interact with the barrel-mounting fixture.

Quick take-down firearms and methods of using quick-take down firearms. The quick-take down includes an upper receiver coupling and a barrel coupling. The quick take-down can be unlocked by sliding a sliding lock collar in a translational motion to an unlocked position to release locking elements from a locked configuration. In the unlocked position, a barrel and handguard may be installed onto and removed from the upper receiver of the firearm. Releasing the sliding lock collar returns it to a locked position, securing the barrel and handguard to the upper receiver.

A grenade launcher may include at least one barrel for receiving a grenade, a support for releasably mounting the grenade launcher to a carrier, and a receiving slot receiving a removable primer cartridge. The primer cartridge when received in the receiving slot may hold a primer in position for firing the grenade in the barrel.

A secondary firearm with a rail mount attachable to a rail assembly of a primary firearm is disclosed. The secondary firearm comprises a body having at least one retaining pin hole and a bolt stop hole and a housing disposed about the body. The housing comprises at least one retaining pin aperture and/or a bolt stop aperture. The secondary firearm also includes at least one fastener disposed within at least one of the at least one retaining pin aperture and the at least one retaining pin hole and/or the bolt stop aperture and the bolt stop hole to fasten the housing to the body.

Quick take-down firearms and methods of using quick-take down firearms. The quick-take down includes an upper receiver coupling and a barrel coupling. The quick take-down can be unlocked by sliding a sliding lock collar in a translational motion to an unlocked position to release locking elements from a locked configuration. In the unlocked position, a barrel and handguard may be installed onto and removed from the upper receiver of the firearm. Releasing the sliding lock collar returns it to a locked position, securing the barrel and handguard to the upper receiver.

A pistol having a handle piece, a slide that is movable on the handle piece along guides, and a barrel. Provided in the handle piece is a blocking device for the forward movement of the barrel, where the blocking device has a retaining platelet that is movable in a slot and is under the action of a spring, for a barrel projection. A spring platelet is provided in the slot between the spring and the retaining platelet, where the spring platelet is designed such that it can be partially extracted from the slot transversely with respect to the center plane of the pistol. In this extracted position, the spring platelet is pivotable, together with the retaining platelet, against the force of the spring, with the result that the retaining platelet passes out of the movement path of the barrel projection and the slide can be withdrawn forward.

A firearm has a frame, a barrel assembly, a slide assembly which holds a recoil assembly, and a firing system with a trigger assembly and safety mechanism. The slide and recoil assemblies are located above the barrel so that the barrel is situated between the topmost part of the frame and the bottom of the slide assembly. The barrel assembly includes a housing which is covered by the slide assembly and secures one side of the recoil assembly. The barrel can be removably connected to the frame through front and rear mounts with removable pins and can modularly connect with the frame and slide assembly so that different caliber barrels can be interchanged. In addition to the trigger, the trigger assembly has a hammer, a sear, a lever arm that engages the trigger, sear and hammer, and springs that bias the trigger assembly components.

A firearm includes a quick-change barrel including: (a) at least two barrel-mounting features, each configured to selectively interact with a barrel-receipt feature of the firearm during mounting of the quick-change barrel to a mounting structure of the firearm, or (b) at least one barrel-mounting feature configured to selectively interact with at least two barrel-receipt features of the firearm during mounting of the quick-change barrel to a mounting structure of the firearm. The barrel is selectively mountable to the firearm in at least two orientations depending, per (a), upon which of the at least two barrel-mounting features interact with the barrel-receipt feature or, per (b), upon which of the at least two barrel-receipt fixtures interact with the barrel-mounting fixture.