Abstract: A bolt assembly for firearms utilizing a blowback type operating system. The bolt assembly comprises a non-rotatable bolt slideably disposed in the receiver for forward and rearward movement and a dead blow weight assembly slideably coupled to the bolt. The dead blow weight assembly may be two-piece comprising a dead blow weight and dead blow top member. These parts are separate components movable independently of each other, but functionally interacting and cooperating under recoil after discharging the firearm to eject a spent cartridge casing and chamber a new cartridge as the action is reset. When the firearm discharged, a two-stage felt recoil force is generated by this mechanism, thereby advantageously producing peak forces which are less in magnitude than the single strong felt recoil force experienced by users with conventional one-piece bolt used in many blowback type firearms.

Abstract: A toy dart gun is provided including a gun shell, a trigger assembly, and a compression assembly. The trigger assembly includes a swing arm coupled to the gun shell and movable between a safe position and a fire position, and a swing arm pusher extending from the gun shell and having an inclined surface. The compression assembly includes a compression chamber positioned within the gun shell and having a barrel opening and an opposite holder opening, and a plunger slidably insertable through the holder opening and movable between a retracted position and an extended position. As the swing arm moves toward the fire position, the swing arm engages the plunger and pulls the plunger toward the extended position. When the swing arm is in the fire position, the swing arm pusher deflects the swing arm from engagement with the plunger and the plunger is biased toward the retracted position.

Abstract: A decoy device including: a cartridge casing; and two or more pyrophoric assemblies disposed longitudinally in the casing for sequential ejection from the casing, the two or more pyrophoric assemblies including: a pyrophoric material; a piston positioned rearward in an ejection direction relative to the pyrophoric material, the piston being movable in the ejection direction upon application of ejection force to eject the pyrophoric material from the casing; one or more energetic materials positioned rearward in an ejection direction relative to the piston, the one or more energetic materials being initiated by electrical impulse to provide the ejection force to the piston; and an inert barrier layer positioned rearward in an ejection direction relative to the impulse cartridge.

Abstract: A concealable firearm is disclosed. The handle of the firearm is adjustable from a concealed position to an in-use position. When the handle is in the concealed position, the firearm has the appearance of a cell phone. This allows the firearm to be carried in the open and be easily accessible without drawing attention to the person carrying the firearm. The firearm cannot fire when in the concealed position because the trigger is not accessible.

Abstract: A magazine loader for loading a batch of rimmed cartridges into a tubular rifle magazine is disclosed. In embodiments, the magazine loader comprises an elongate body comprising a hopper portion and a tubular magazine receiving portion with a circular aperture for receiving the tubular rifle magazine. In embodiments, the body defines a feed passageway extending between the hopper portion and the circular aperture of the tubular magazine receiving portion. The body may define, extending along the feed passageway, a first cartridge orienting passageway defined by a first cartridge orienting portion, a second cartridge orienting passageway defined by a second cartridge orienting portion, a third cartridge orienting passageway defined by a third cartridge orienting portion, and a fourth cartridge orienting passageway defined by a fourth cartridge orienting portion.

Abstract: A firearm has a first side, a second side, a forward section with a barrel, and a rearward section with a stock. The firearm has a central section with an actuation button on the first side and a bolt catch and bolt catch linkage on the second side. A magazine and magazine release are between the actuation button and the bolt catch linkage. An actuation pin extends through the central section from the actuation button to both the bolt catch linkage and the magazine release. A coil spring urges the actuation button outwardly to an inoperative extended orientation. The actuation button is adapted to be depressed for both releasing the magazine and engaging the bolt catch.

Abstract: Gun (1) comprising a gun frame (2); a barrel (4), supported by the gun frame (2), proximally delimiting a firing chamber (6) extending along a longitudinal axis (X); a slide (8), translatable longitudinally in relation to the barrel (4) between a forward configuration wherein the slide closes the firing chamber (6), and a rearward configuration wherein it is distanced from a proximal mouth (12) of the firing chamber (6), to open the latter; wherein orientation of said chamber (6) is substantially parallel to said axis (X) in the forward configuration and in the rearward configuration; and a locking device (10) mechanically locking barrel (4) and slide (8) to each other in the forward configuration, and that in the rearward configuration is guided transversally in relation to the barrel (4) for unlocking the slide (8).

Abstract: A modular trigger assembly having auto-tensioning hammer pin and trigger pins which allow for rapid installation and removal of the modular trigger assembly from the lower receiver of an ArmaLite style modular rifle using minimal tools. When installed and under tension, the auto-tensioning pins remain flush with the exterior of the lower receiver and present no external parts outside of the lower receiver while maintaining anti-walk and anti-roll properties.

Abstract: A marine vessel comprising: at least one buoyant tubular foil; and at least one baffle plate positioned about the perimeter of the at least one buoyant tubular foil so as to protrude into the flow of water passing by the perimeter of the at least one buoyant tubular foil, whereby to create a high-pressure zone fore of the at least one baffle plate and a low-pressure zone immediately aft of the at least one baffle plate, whereby to create a dense stream of supercavitated water immediately aft of the at least one baffle plate.

Abstract: A gas turbine engine comprises a housing having an inlet leading to a fan rotor. A bypass door is mounted upstream of the inlet to the fan rotor, and is moveable away from a non-bypass position to a bypass position to selectively bypass boundary layer air vertically beneath the engine. An aircraft is also disclosed.

Abstract: Disclosed herein is a modified rifle bolt carrier allowing a selectively openable vent/valve at the location where exhaust gas is pressurizing the bolt carrier to control carrier speed under suppressed fire in a first valve position or unsuppressed fire in a second valve position. A valve core is disclosed which may be rotated 180° to a first “open” setting for non-suppressed fire from its position in a “closed” position for suppressed fire, and a third “median” position. The modified bolt carrier will allow an operator of the firearm to adjust for a suppressor without changing the gas block or having to modify or adapt the front end or barrel end of the firearm.

Abstract: Removable vehicle window security shield assemblies and related methods of use and/or installation. In some embodiments, an insert-shield assembly may comprise an insert-shield with or without a separate inner shield, one or both of which may comprise a ballistic-rated, transparent material. The assembly may be mounted in and/or to one or more existing windows or other openings of a vehicle. In some embodiments, an inner shield of the shield assembly may be removeable from the assembly. In some embodiments, the entire assembly or a portion thereof may be removed to allow an officer or other user to use the removed portion as a portable shield. The removed portion may be returned to the vehicle following use to enhance the protection of the vehicle. In some embodiments, a personal shield may be inserted into and held by a holster that is positioned within the window frame of a vehicle.

Abstract: A modular turret for an armored vehicle includes: an invariable and unique basic structural unit configured to be interchangeable, called a standard shell, equipped with interface means; and a plurality of interchangeable and removable functional modules and/or systems securable to the standard shell by specific fastening means distinctive from a connection of each functional module to the standard shell. The interface means allow an assembly of a set of different modules and/or systems of a same functional type on the standard shell at an interfacing zone on the latter. The standard shell includes an assembly of a plurality of plates with different shapes and sizes giving the standard shell a geometric shape with fixed dimensions. The plates have orifices and/or connectors for fastening the interchangeable and removable functional modules and/or systems. The plurality of plates includes a base metal sheet including a base of the standard shell.

Abstract: A method for determining airspeed of an aircraft that includes determining a rotor model relating a power coefficient of a propeller of the aircraft to an axial inflow velocity through the propeller as a function of a set of rotor operating parameters; determining the set of rotor operating parameters by sampling an electronic control signal associated with an electric motor actuating the propeller; computing the axial inflow velocity through the propeller based on the set of rotor operating parameters using the rotor model; and determining the airspeed based on the axial inflow velocity.

Abstract: Trigger assemblies are provided for restraining a firing pin of a firearm on a selective basis. The triggers assemblies include a first and a second lever mounted for rotation within a housing. The first lever is configured to be rotated by the user, and rotation of the first lever imparts rotation to the second lever to initiate the discharge of the firearm. The trigger assemblies also include a safety mechanism having a safety lever that is movable between a first and a second angular position. The safety lever is configured to prevent movement of the first and second levers when the safety lever is in its first angular position, thereby preventing discharge of the firearm.

Abstract: An oil and gas well shaped charge perforator capable of providing an exothermic reaction after detonation is provided, comprising a housing (2), a high explosive (3), and a reactive liner (6) where the high explosive is positioned between the reactive liner and the housing. The reactive liner (6) is produced from a reactive composition which is capable of sustaining an exothermic reaction during the formation of the cutting jet. The composition is a pressed i.e. compacted particulate composition comprising at least two metals, wherein one of the metals is present as spherical particulate, and the other metal is present as a non-spherical particulate. There may also be at least one further metal, which is not capable of an exothermic reaction with the reactive composition, present in an amount greater than 10% w/w of the liner. To aid consolidation a binder may also be added.

Abstract: Provided is a firearm lower receiver configured to mate with an AR-pattern, auto-loading upper receiver assembly. The lower receiver has a body and a hinge mechanism having a fixed part integral to the lower receiver body and a moving part to which a buffer tube is mounted. The hinge is movable between an extended, operating position where the buffer tube is substantially aligned with the bolt carrier and a folded position. The fixed part includes a carrier blocking member movable between a blocking position where the blocking member prevents rearward movement of a bolt carrier in the upper receiver and a displaced position. The blocking member is spring biased toward the blocking position. A striker extends from the moving part and is configured to contact the carrier blocking member and move it against the spring bias to the displaced position when the hinge mechanism is in the extended, operating position.

Abstract: A system and method for displaying an aiming vector of a firearm to a user, including: at least one illuminating source, positioned along a longitudinal axis of a barrel of the firearm and at least one light sensor, mounted onto a headgear at a predetermined position, and configured to detect light parameters from the at least one light source, and a processor, configured to: (i) receive the detected light parameters of the at least one illuminating source (ii) determine a location of the at least one illuminating source, based on the detected light parameters, and (iii) generate an aiming vector of the firearm based on the location of the at least one illuminating source with respect to the predetermined position of the at least one light sensor. A display unit mounted onto a headgear is configured to display the aiming vector generated by the processor.

Abstract: The present invention discloses an ammunition device or pellet suitable for use with gas fired guns, such as paintballing guns. The pellets have a body and a charge that are arranged as a single unit of formed as separate parts which are assembled for use. The body can be single use or reusable. The charge contains marking material and is a single-use portion arranged to be adjacent to the body. The charge has breakable outer shell for surrounding marking material.

Abstract: A cartridge with an expanding bullet that has advantageous terminal effects over an extended range. The expanding bullet including a bullet body including a metal jacket extending from a tail portion to a nose portion and surrounding an interior solid core and defining a forward opening and interior cavity. A tip has an exterior surface substantially flush with an exterior surface of the metal jacket. The tip has a main portion forward of the opening and a tip retention portion that at least partially fills the interior cavity. In certain embodiments the tip retention portion includes one or more fluid entry facilitation means such as a fracture regions configured to, upon impact of the bullet with a target, fracture or deform to expose one or more fluid pathways into the interior cavity and to a forward facing interior surface for initiating expansion of the expanding bullet.