Breechblocks for firearms, the breechblocks including a barrel axis and a barrel extension, including a bolt with cam pin and cam pin axis, and a bolt carrier which has at least one end face and an assembly groove and a substantially S-shaped cam slot with a locked position and an unlocked position, wherein the assembly groove at the locked position of the cam slot is subsequently formed substantially from behind in the forward barrel direction and is essentially U-shaped.

A rifle includes a magazine well, a barrel, and an exo-bolt. The barrel is configured to be detachably coupled to the magazine well. The barrel includes a forward barrel portion on an end of the barrel opposite the magazine well. The exo-bolt is configured to travel along an exterior of the barrel.

A rifle includes a magazine well, a barrel, and an exo-bolt. The barrel is configured to be detachably coupled to the magazine well. The barrel includes a forward barrel portion on an end of the barrel opposite the magazine well. The exo-bolt is configured to travel along an exterior of the barrel.

The modular upper receiver assembly for firearms is an adapter allowing interchanging of barrels of different calibers to attach to an upper receiver assembly. The adapter assembly serves to provide a quick changeover coupling means for connecting an assortment of barrels of different calibers and lengths to the receiver. The coupling includes a barrel retaining bushing and adapter pair with threaded surfaces on the receiver for a threaded engagement, reinforced with threaded fastener compression for improved rigidity.

The modular upper receiver assembly for firearms is an adapter allowing interchanging of barrels of different calibers to attach to an upper receiver assembly. The adapter assembly serves to provide a quick changeover coupling means for connecting an assortment of barrels of different calibers and lengths to the receiver. The coupling includes a barrel retaining bushing and adapter pair with threaded surfaces on the receiver for a threaded engagement, reinforced with threaded fastener compression for improved rigidity.

A rifle has a fixed main body, including a barrel, a receiver with an upper opening, and a breech element. A trigger group is at least partially housed in the receiver, including a trigger and a hammer device operable by the trigger. A carriage assembly includes an assembly body and a shutter group at least partially housed in the assembly body. The carriage assembly is positioned on the receiver at the upper opening and is axially movable by a user between an advanced shooting configuration and a retracted rearming configuration. Upon axial movement of the carriage assembly, between the retracted and advanced configurations, the shutter group is first moved axially in translation and then in roto-translation. The shutter group includes a central body and a command pin protruding radially from the shutter body. The command pin engages the assembly body so reciprocal interaction guides the shutter group in rotation.

A rifle has a fixed main body including a barrel, a receiver with an upper opening, and a breech element. A carriage assembly is axially movable between an advanced shooting configuration and a retracted rearming configuration, and vice versa. The carriage assembly includes an assembly body positioned on the receiver at the upper opening, which is axially slidably movable, having a through housing extending transversally, a firearm handle with an outer portion grippable and an inner portion shaped for complementarily housing in the through housing, being insertable both sides, and a shutter group partially accommodated in the assembly body, including a shutter body and a shutter head. The shutter head is mountable onto the shutter body in first and second angular positions, which are reciprocally inverted. The rifle is configurable for a right-handed or a left-handed person by changing the position of the firearm handle and the shutter head.

A rifle has a fixed main body including a barrel, a receiver with an upper opening, and a breech element. A carriage assembly is axially movable between an advanced shooting configuration and a retracted rearming configuration, and vice versa. The carriage assembly includes an assembly body positioned on the receiver at the upper opening, which is axially slidably movable, having a through housing extending transversally, a firearm handle with an outer portion grippable and an inner portion shaped for complementarily housing in the through housing, being insertable both sides, and a shutter group partially accommodated in the assembly body, including a shutter body and a shutter head. The shutter head is mountable onto the shutter body in first and second angular positions, which are reciprocally inverted. The rifle is configurable for a right-handed or a left-handed person by changing the position of the firearm handle and the shutter head.

A recoil assembly for a rifle includes a barrel assembly, a bolt, bolt actuator, and a buffer assembly. The barrel assembly includes a barrel secured to a barrel extension. The barrel assembly is configured to be movably received through the fore end of a receiver and to move axially relative to the upper receiver when the rifle is fired. The barrel extension is coupled to a hydraulic buffer assembly located below the barrel extension and counteracts recoil forces acting on the barrel extension when the rifle is fired. An op-rod spring is coupled to an op rod extending from a gas piston assembly on the barrel. The op-rod spring counteracts recoil forces acting the bolt actuator when the rifle is fired.

A firearm includes a barrel having a breech end. A receiver is engaged with the breach end of the barrel and defines a chamber. A vent path is through the barrel downstream from the breech end. A latch is downstream from the vent path. A bolt is at least partially inside the chamber. The bolt has a locked position to prevent the bolt from moving away from the breech end of the barrel and a released position that allows the bolt to move away from said breech end of the barrel.