Abstract: Multiple report stun grenades have an elongated body defining a body axis and having a sidewall and opposed top and bottom end faces, the body including a plurality of delay chambers each containing a different delay feature, the body having a plurality of flash charge chambers each containing a quantity of flash charge material, the body defining a plurality of ignition passages, each ignition passage communicating from a respective flash charge chamber to an associated delay chamber, each flash charge chamber having at least one exhaust aperture, and each of the exhaust apertures penetrating at least one of the top and bottom end faces. Each of the flash charge chambers may have a first exhaust aperture penetrating the top end face, and a second exhaust aperture penetrating the bottom end face. Each of the flash charge chambers may be an elongated bore parallel to the body axis.

Abstract: A universal tube launched munitions system has a launcher base having an array of a plurality of initiator stations, first and second cassettes each having a mounting facility operable for releasable connection to the launcher base, each of the cassettes having a plurality of barrels, the barrels of the first cassette been axially registered with the first quantity of the initiator stations, and the barrels of the second cassette been axially registered with a different second quantity of the initiator stations. The barrels of the first cassette may be axially registered with all of the initiator stations. The barrels of the second cassette may be axially registered with a subset of the initiator stations the barrels of the first cassette are axially registered with. The barrels of the first cassette may have a different diameter than the barrels of the second cassette.

Abstract: A universal tube launched munitions system has a launcher base having an array of a plurality of initiator stations, first and second cassettes each having a mounting facility operable for releasable connection to the launcher base, each of the cassettes having a plurality of barrels, the barrels of the first cassette been axially registered with the first quantity of the initiator stations, and the barrels of the second cassette been axially registered with a different second quantity of the initiator stations. The barrels of the first cassette may be axially registered with all of the initiator stations. The barrels of the second cassette may be axially registered with a subset of the initiator stations the barrels of the first cassette are axially registered with. The barrels of the first cassette may have a different diameter than the barrels of the second cassette.

Abstract: Multiple report stun grenades have an elongated body defining a body axis and having a sidewall and opposed top and bottom end faces, the body including a plurality of delay chambers each containing a different delay feature, the body having a plurality of flash charge chambers each containing a quantity of flash charge material, the body defining a plurality of ignition passages, each ignition passage communicating from a respective flash charge chamber to an associated delay chamber, each flash charge chamber having at least one exhaust aperture, and each of the exhaust apertures penetrating at least one of the top and bottom end faces. Each of the flash charge chambers may have a first exhaust aperture penetrating the top end face, and a second exhaust aperture penetrating the bottom end face. Each of the flash charge chambers may be an elongated bore parallel to the body axis.

Abstract: A spring-loaded quick coupling barrel retaining system for a firearm. The firearm includes a receiver, a barrel nut, and barrel assembly rotatably mounted thereto. In one embodiment, the barrel assembly may include barrel locking lugs which rotatably engage and interlock with corresponding locking elements disposed on the barrel nut such as splines. The barrel assembly further includes a spring member forming a flexible interface with the barrel nut. The spring member self-tensions and tightens the lockup between the barrel assembly and barrel nut to promote a tight fit. Some embodiments may include a lock nut and a setting tool for adjusting the spring force to promote consistently proper lockup from one replacement barrel assembly to the next.

Abstract: A spring-loaded quick coupling barrel retaining system for a firearm. The firearm includes a receiver, a barrel nut, and barrel assembly rotatably mounted thereto. In one embodiment, the barrel assembly may include barrel locking lugs which rotatably engage and interlock with corresponding locking elements disposed on the barrel nut such as splines. The barrel assembly further includes a spring member forming a flexible interface with the barrel nut. The spring member self-tensions and tightens the lockup between the barrel assembly and barrel nut to promote a tight fit. Some embodiments may include a lock nut and a setting tool for adjusting the spring force to promote consistently proper lockup from one replacement barrel assembly to the next.

Abstract: A firearm with barrel interlock system for a rotary mounted quick coupling barrel assembly. In one embodiment, the firearm includes a receiver and barrel assembly rotatably mounted thereto. A bolt carrier supporting a bolt is slidably disposed in the receiver and axially movable into and out of battery with the barrel assembly. The barrel interlock system may include a first barrel anti-rotation locking element disposed on the barrel assembly and a mating second barrel anti-rotation locking element disposed on the bolt carrier that is engageable with the first element. When mutually engaged, the first and second locking elements form a meshed relationship and prevent rotation and removal of the barrel assembly from the receiver. In some non-limiting embodiments, the locking elements may be in the form of a protrusion and complementary shaped recess.

Abstract: A spring-loaded quick coupling barrel retaining system for a firearm. The firearm includes a receiver, a barrel nut, and barrel assembly rotatably mounted thereto. In one embodiment, the barrel assembly may include barrel locking lugs which rotatably engage and interlock with corresponding locking elements disposed on the barrel nut such a splines. The barrel assembly further includes a spring member forming a flexible interface with the barrel nut. The spring member self-tensions and tightens the lockup between the barrel assembly and barrel nut to promote a tight fit. Some embodiments may include a lock nut and a setting tool for adjusting the spring force to promote consistently proper lockup from one replacement barrel assembly to the next.

Abstract: A spring-loaded quick coupling barrel retaining system for a firearm. The firearm includes a receiver, a barrel nut, and barrel assembly rotatably mounted thereto. In one embodiment, the barrel assembly may include barrel locking lugs which rotatably engage and interlock with corresponding locking elements disposed on the barrel nut such a splines. The barrel assembly further includes a spring member forming a flexible interface with the barrel nut. The spring member self-tensions and tightens the lockup between the barrel assembly and barrel nut to promote a tight fit. Some embodiments may include a lock nut and a setting tool for adjusting the spring force to promote consistently proper lockup from one replacement barrel assembly to the next.

Abstract: A gas operated autoloading firearm having an improved bolt carrier. The gas piston system may include a barrel defining a longitudinally-extending bullet pathway, a gas block defining a piston bore, a passageway fluidly connecting the bore with the bullet pathway for diverting combustion gas to the bore upon discharging the firearm, and a piston slidably disposed in the bore for reciprocating movement. The piston actuates a reciprocating bolt assembly including a bolt carrier slidably received in a receiver. The bolt carrier includes supporting and guiding surfaces configured to reduce receiver wear and bolt carrier drag.

Abstract: A firearm with barrel interlock system for a rotary mounted quick coupling barrel assembly. In one embodiment, the firearm includes a receiver and barrel assembly rotatably mounted thereto. A bolt carrier supporting a bolt is slidably disposed in the receiver and axially movable into and out of battery with the barrel assembly. The barrel interlock system may include a first barrel anti-rotation locking element disposed on the barrel assembly and a mating second barrel anti-rotation locking element disposed on the bolt carrier that is engageable with the first element. When mutually engaged, the first and second locking elements form a meshed relationship and prevent rotation and removal of the barrel assembly from the receiver. In some non-limiting embodiments, the locking elements may be in the form of a protrusion and complementary shaped recess.

Abstract: A barrel retaining system for a firearm includes a firearm receiver having a barrel nut coupled thereto and a barrel assembly, which in one embodiment may include a barrel with a barrel extension coupled thereto. The barrel extension includes a plurality of barrel locking lugs that rotatably engage corresponding locking elements disposed on the barrel nut. The barrel extension may further include a flange that may engage one end of the locking elements of the barrel nut and the barrel locking lugs may engage an opposite end of the locking elements to wedge the locking elements therebetween for securing the barrel extension to the barrel nut. The firearm may be an autoloading rifle in some embodiments.

Abstract: A spring-loaded quick coupling barrel retaining system for a firearm. The firearm includes a receiver, a barrel nut, and barrel assembly rotatably mounted thereto. In one embodiment, the barrel assembly may include barrel locking lugs which rotatably engage and interlock with corresponding locking elements disposed on the barrel nut such a splines. The barrel assembly further includes a spring member forming a flexible interface with the barrel nut. The spring member self-tensions and tightens the lockup between the barrel assembly and barrel nut to promote a tight fit. Some embodiments may include a lock nut and a setting tool for adjusting the spring force to promote consistently proper lockup from one replacement barrel assembly to the next.

Abstract: A spring-loaded quick coupling barrel retaining system for a firearm. The firearm includes a receiver, a barrel nut, and barrel assembly rotatably mounted thereto. In one embodiment, the barrel assembly may include barrel locking lugs which rotatably engage and interlock with corresponding locking elements disposed on the barrel nut such a splines. The barrel assembly further includes a spring member forming a flexible interface with the barrel nut. The spring member self-tensions and tightens the lockup between the barrel assembly and barrel nut to promote a tight fit. Some embodiments may include a lock nut and a setting tool for adjusting the spring force to promote consistently proper lockup from one replacement barrel assembly to the next.

Abstract: A gas piston operating system for an autoloading firearm. The gas piston system may include a barrel having a longitudinally-extending bullet pathway, a gas block defining a piston bore, a passageway fluidly connecting the bore with the bullet pathway for diverting combustion gas from the pathway to the bore upon discharging the firearm, and a piston slidably disposed in the bore for reciprocating movement. In one embodiment, the piston includes a head having an axially-extending protrusion projecting towards the passageway. The protrusion is configured for slidable insertion into the passageway. The piston is movable from a first actuation position in which the protrusion is inserted into the passageway to a second actuation position in which the protrusion is at least partially withdrawn from the passageway. The protrusion acts to pretension a mechanical linkage between the piston and a reciprocating bolt assembly.

Abstract: A barrel retaining system for a firearm includes a firearm receiver having a barrel nut coupled thereto and a barrel assembly, which in one embodiment may include a barrel with a barrel extension coupled thereto. The barrel extension includes a plurality of barrel locking lugs that rotatably engage corresponding locking elements disposed on the barrel nut. The barrel extension may further include a flange that may engage one end of the locking elements of the barrel nut and the barrel locking lugs may engage an opposite end of the locking elements to wedge the locking elements therebetween for securing the barrel extension to the barrel nut. The firearm may be an autoloading rifle in some embodiments.

Abstract: A barrel retaining system for a firearm includes a firearm receiver having a barrel nut coupled thereto and a barrel assembly, which in one embodiment may include a barrel with a barrel extension coupled thereto. The barrel extension includes a plurality of barrel locking lugs that rotatably engage corresponding locking elements disposed on the barrel nut. The barrel extension may further include a flange that may engage one end of the locking elements of the barrel nut and the barrel locking lugs may engage an opposite end of the locking elements to wedge the locking elements therebetween for securing the barrel extension to the barrel nut. The firearm may be an autoloading rifle in some embodiments.

Abstract: A barrel retaining system for a firearm includes a firearm receiver having a barrel nut coupled thereto and a barrel assembly, which in one embodiment may include a barrel with a barrel extension coupled thereto. The barrel extension includes a plurality of barrel locking lugs that rotatably engage corresponding locking elements disposed on the barrel nut. The barrel extension may further include a flange that may engage one end of the locking elements of the barrel nut and the barrel locking lugs may engage an opposite end of the locking elements to wedge the locking elements therebetween for securing the barrel extension to the barrel nut. The firearm may be an autoloading rifle in some embodiments.

Abstract: A gas operated autoloading firearm having an improved bolt carrier. The gas piston system may include a barrel defining a longitudinally-extending bullet pathway, a gas block defining a piston bore, a passageway fluidly connecting the bore with the bullet pathway for diverting combustion gas to the bore upon discharging the firearm, and a piston slidably disposed in the bore for reciprocating movement. The piston actuates a reciprocating bolt assembly including a bolt carrier slidably received in a receiver. The bolt carrier includes supporting and guiding surfaces configured to reduce receiver wear and bolt carrier drag.