Abstract: A detonator which includes a housing which has a passage with an inlet and an outlet and which is of reducing cross sectional area from the inlet to the outlet and wherein the inlet is configured to be exposed to an end of a shock tube, and a fusible link is located at the outlet.

Abstract: A reticle for an aiming device includes a number of holdover indicators on the reticle that may be individually selected; an input for receiving ballistics data; and a processor configured to, based at least in part on the received ballistics data, select one or more of the holdover indicators; and cause the selected holdover indicator or indicators to visibly change state on the reticle. Methods of operating a digital reticle are also described. Further disclosed is a system that includes the reticle above, as well as a rangefinder for providing range data and a ballistics calculator for providing ballistics data. Some variations include ballistics data stored in a memory.

Abstract: A folding stock assembly for a firearm includes a hinge fitting attached to the firearm, a left hinge pin disposed on a left side of the hinge fitting, a right hinge pin disposed on a right side of the hinge fitting, at least one moving member, a rear housing disposed on a rear side of the hinge fitting, a rearward configuration wherein the rear housing is connected to both the left hinge pin and the right hinge pin, a left side folded configuration wherein the rear housing is connected to the left hinge pin and the rear housing is moved toward a left side of the firearm, and a right side folded configuration wherein the rear housing is connected to the right hinge pin and the rear housing is moved toward a right side of the firearm.

Abstract: Ballistic and athletic personal protective equipment utilizing rigid panel(s) featuring designs for improved cooling employing “stack effect” airflow in combination with optimized wearer contact surface geometry. Improved ballistic and athletic personal protective equipment designs contain rigid panel(s) for protection of wearer from impacts, ballistic threats and the like. The equipment is provided with spacers arranged to provide a stack effect powered airflow between rigid panel(s) and wearer, cooling the same. The spacers are further designed, dimensioned and arranged to provide optimal heat transfer and mass transfer efficiency from wearer to cooling air within the protective equipment system, providing optimal cooling effects. The system is simple, light, and inexpensive, providing improved wearer comfort and safety from hyperthermia for optimal performance at elevated temperatures.

Abstract: A blaster for shooting projectiles that includes a housing that defines a housing interior, and a variable velocity barrel assembly positioned in the housing interior. The variable velocity barrel assembly includes a barrel that defines a barrel axis and a barrel interior. The barrel includes an exit opening at a distal end thereof. At least a first opening communicates the barrel interior with an exterior of the barrel. The first opening is defined through a side wall of the barrel. A slider member that includes a cylindrical portion that surrounds the barrel is movable axially along the barrel between a maximum velocity position where the cylindrical portion covers the first opening and a minimum velocity position where the slider member does not cover the first opening.

Abstract: The present folding stock adapter can be used with many types of military-type assault rifles that typically comprise a receiver extension, buffer and action spring. The present folding stock adapter can be used to add a folding capability to a standard stock allowing it to fold against a rifle's receiver when the weapon is not in use, thus reducing the overall length of the weapon. This reduction in length can facilitate its maneuverability, storage and transport in cramped quarters. The present device can also allow for the quick unfolding of the stock in order to allow the weapon to function and be fire normally.

Abstract: Liners (150), fittings (11-22), and spacers (23-25) are provided to assemble the jet (170) units, which work as explosives (110) and detonators (120) to form stand-off distance and air-deck (140) space. The liners (150) release jets (170) and the fittings (11-22) and spacers (23-25) are designed to attach the liner (150) firmly to the explosives (110), inducing the cavity effect. The objective of the present invention is to provide a blasting method using a jet (170) unit to overcome the limits of sympathetic detonation, applying a mechanism that is ideal according to the analysis of observations in blast-hole (100) blasting. The application of jet (170) units for jet (170) detonation in blast-hole (100) blasting overcomes the performance limits of explosives (110) manufacturing and the conceptual limits of detonators (120) functionalities and improves the channel effect, dead pressing, loss of power, and stopping of detonation etc.

Abstract: Firearm bolt assemblies and firearms including the same are described. In embodiments the firearm bolt assemblies are configured to localize compressive forces applied during a transition from an initial position to a firing position to a first cam system on one side of the firearm bolt assembly, and to localize compressive forces applied during a transition from the firing position to the initial position to a second cam system another side of the firearm bolt assembly. Localizing the forces in that manner enables the use of a first cam system that is relatively robust compared to the second cam system.

Abstract: A system for firing reduced energy cartridges from a modern sporting rifle utilizes a bolt assembly weighing less than a conventional bolt assembly for such rifles and utilizes blow back for cycling the bolt assembly rather than gas operation. A bolt insert in a polymer bolt carrier of the bolt assembly has a projection that fits within a recess on the rear face of reduced energy cartridges. The reduced energy cartridges having a polymer casing, a rimfire power load for propellant, the power load recessed from the rear face of the casing. Tuning the bolt may comprise adjusting the weight of the bolt or the sliding resistance of the bolt assembly in the upper receiver. The bolt may be formed by metal injection molding with a polymer bolt carrier attached thereto.

Abstract: Ambidextrous bolts that allow a user to quickly and easily change the side of the firearm from which a spent casing is ejected by application of a simple switching mechanism that does not require disassembly of the firearm. Aspects of the disclosure also include debris shields for improving the longevity and reliability of extractors, firearms that are configured for ambidextrous operation, methods of using firearms, and methods of modifying firearms to incorporate ambidextrous functionality.

Abstract: Airguns are provided with semi-automatic action.

Abstract: A bullpup shotgun which ejects shells from the bottom of its action has a reciprocable cover which, when in a closed position, overlies the breech end of the shotgun's barrel. When in an open position, the cover is in spaced relation to the barrel breech end, allowing access to the shotgun's action to clear an ammunition feed malfunction. The cover is mounted on a butt stock, and is slidable or rotatable relatively to the shotgun's butt stock to effect motion of the cover between the open and closed positions.

Abstract: Embodiments of the invention discussed herein surround cleaning of firearms which are configured to pass through internal aspects—such as through a barrel and/or breach of a firearm. Embodiments include the use of various cleaning elements combinable with each other to provide a faster and more efficient cleaning of internal aspects of a firearm.

Abstract: A puncture mechanism that is configured to puncture a seal provided over a mouth of a canister of compressed gas received within a less-lethal device to propel a projectile from the less-lethal device when a trigger mechanism of the less-lethal device is actuated by a user. The puncture mechanism includes a displaceable body that has a piercing mechanism which is configured to pierce the seal provided over a mouth of the canister. The puncture mechanism further includes an actuation arrangement, which comprises a trigger mechanism, for displacing the displaceable body towards the canister whereby the piercing mechanism pierces a seal of the canister and compressed gas flows into a barrel of the less-lethal device to propel the projectile from the less-lethal device.

Abstract: A method and apparatus for using a tandem sub to connect one or more perforating gun assemblies, having a rotational bearing mechanism lining the inner diameter in both ends to allow the charge tube assembly to rotate within the gun body.

Abstract: A projectile entangling device, cartridge and method for entangling an object. The projectile entangling device comprises a bolt slidably engaging within a receiver. A barrel is coupled to the receiver and is adjacent to a chamber. A gas conduit couples a compressed gas container to the bolt. A valve is positioned within the gas conduit. A trigger activates the valve and dispensing a compressed gas from the compressed gas container, through the gas conduit and exits the bolt. A first projectile and a second projectile are positioned within the cartridge. A tether is coupled to the first projectile and the second projectile. The first projectile, the second projectile and the tether are propelled from the cartridge and expelled from the barrel upon the compressed gas exiting the bolt. The tether elongates for distancing the first projectile from the second projectile for defining an expanding projectile and entangling with the object.

Abstract: An improved bolt and bolt carrier with integral gas key having an extension nozzle threadedly secured and pinned to the gas key for use with a direct gas operated firearm is provided. The extension nozzle is designed to receive a portion of the host firearms gas operating system. The firing pin retaining pin is oriented so as to expose its widest profile to the firing pins annular flange, increasing its service life. The bolt has a plurality of lugs extending from its forward end and an extractor recess. The extractor recess is constructed to accommodate an enlarged extractor claw while not undercutting the bolt lugs adjacent thereto. The extractor engages approximately 57% more of a seated ammunition cartridges rim as compared to some prior art AR15/M16 type extractors used with automatic firearms chambered in 6.8SPC. The result is an improved bolt and bolt carrier which provides for increased operational reliability.

Abstract: A projectile launch apparatus for discharging a NERF™ brand dart, or toy launchers each having a rotatable dart carrier in either a gun-like or rifle-like configuration. Each of the apparatus includes an energy creation system embodying a cylinder housing a piston and a launch spring, a handle for priming the apparatus, and components for causing the dart carrier to rotate about an axis perpendicular to the longitudinal axis of the launch apparatus.

Abstract: A gunsight for aiming a firearm may comprise a display and an eyepiece optic positioned rearward of the display for allowing a user to view the display through the eyepiece optic and a motion sensing module. The eyepiece optic may comprise one or more eyepiece lenses. Circuitry of the gunsight is operatively coupled to the microbolometer and the display. The circuitry may comprise one or more processors and a non-transitory computer readable medium storing one or more instruction sets. In some embodiments, the one or more instruction sets include instructions configured to be executed by the one or more processors to receive a stream of motion signals from the motion sensing module and display an image to the user in response to the stream of motion signals.

Abstract: A butt stock that is reversibly attachable to a handgun, the butt stock has a telescopic assembly and a quadrilateral assembly and has at least two states: a compact state and a deployed state. In the deployed state the telescopic assembly is in an extended conformation and the quadrilateral assembly is in an open position while in the compact state the telescopic assembly is in a contracted conformation and the quadrilateral assembly is in a closed position. The butt stock is relatively compact when in the compact state, but when attached to a handgun in a deployed state may provide multiple points of contact that potentially increase the accuracy of the handgun.