A fastener for attaching a magazine to a breech plate, including a circular longitudinal body including at least one protrusion, an upper guide block having at least one slot adapted to cooperate with the protrusion, where the body is provided with a key grip at an upper end and a receiving opening at a lower end, where the fastener is provided with a release position in which the body is in a first rotational position, a set position in which the body is rotated by a first rotational degree from the release position, and a lock position in which the body is rotated by a second rotational degree from the release position. The advantage of the invention is that a magazine can be attached to and removed from an aircraft in a fast and easy way.

A cartridge for a conducted electrical weapon may comprise a body having a first end opposite a second end and an outer surface opposite an inner surface. A projectile may be disposed within the body. The inner surface of the body may define a plurality of grooves extending from the first end of the body to a location within the body.

A nock for an archery arrow or bolt. The nock includes a radial indention configured to be engaged by a biased retainer of a trigger mechanism of a crossbow to retain the arrow or bolt in a desired position relative to the trigger mechanism and/or a bowstring. The radial indention may optionally comprise a groove defined generally continuously around a circumference of the nock. The radial indention is exposed when the nock is coupled with an arrow or bolt such that the radial indention may be engaged by a biased retainer within the trigger mechanism. The nock may further include a generally planar rearward bearing surface configured for being engaged by a bowstring. The nock of the present invention may be suitable for use with a multiple-shot crossbow or a single-shot crossbow. Other aspects of the present invention are directed to a projectile, a projectile retention system, and a crossbow.

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.

A liquid projection bomb includes a shell and is characterized in that functional liquid is filled into the shell, and the shell is made of a soft or hard material easy to crack when bumped. The functional liquid includes water, alcohol, fuel oil, and a solution of water mixed with an extinguishing agent, a fertilizer or a drug.

A liquid projection bomb includes a shell and is characterized in that functional liquid is filled into the shell, and the shell is made of a soft or hard material easy to crack when bumped. The functional liquid includes water, alcohol, fuel oil, and a solution of water mixed with an extinguishing agent, a fertilizer or a drug.

A dual upper receiver for use with a firearm is provided. The dual upper receiver includes a first receiver portion; and a second receiver portion coupled to the first receiver portion. The first receiver portion is configured to couple to a first barrel, a first lower receiver and a first buttstock. The second receiver portion is configured to couple to a second barrel, a second lower receiver and a second buttstock. In embodiments, the dual upper receiver is formed as a unitary body. The dual upper receiver as a unitary body may include the first receiver portion and the second receiver portion are formed from a same piece of material.

A multiple-shot crossbow includes a mainframe, a riser, upper and lower bow limbs and bowstrings, and a trigger mechanism. The mainframe includes upper and lower rails, each for supporting and guiding a corresponding bolt. The riser includes a passage for accommodating loading and launching a bolt. The bow limbs are attached to the riser and the bowstrings are attached to the bow limbs. Each bowstring is arranged independently to be drawn from a brace position to a drawn position and then return to the brace position while launching a bolt positioned on the corresponding rail. The lower bowstring is movable within a longitudinal slot between the upper and lower rails. The trigger mechanism is attached to a rear end of the mainframe and includes upper and lower trigger portions, each retaining a corresponding drawn bowstring and then releasing it upon actuation by a user.

Systems, devices, and methods including a launch control box; a multi-pack launcher (MPL) box; and a cable connecting the launch control box and the MPL box, where the cable comprises: an outer jacket, a shielded braid, a first wire, a second wire, a third wire, and a fourth wire, where the first wire and the second wire are shielded by the shielded braid, where the third wire and the fourth wire are outside of the shielded braid, and where the third wire and the fourth wire act as an antenna.