Methods and apparatus are described for extracting and storing electrical energy from the gaseous discharge of a firearm. In one embodiment a muzzle device is provided comprising of at least one thermoelectric generator which generates electric power, to be stored in a battery, using heat transferred from the gaseous discharge of a firearm to the thermoelectric generator by a heat sink.

Methods and apparatus are described for extracting and storing electrical energy from the gaseous discharge of a firearm. In one embodiment a muzzle device is provided comprising of at least one thermoelectric generator which generates electric power, to be stored in a battery, using heat transferred from the gaseous discharge of a firearm to the thermoelectric generator by a heat sink.

An accessory mounting interface for a firearm, and a related method, are disclosed. The interface has a firearm accessory, a first elongated fastener, and a second fastener rotationally mated to the first elongated fastener. The first elongated fastener has right-handed threading and is arranged through a through hole in the firearm accessory with a first end extending below first and second halves of a first slot protrusion of the firearm accessory. The second fastener has a length greater than a width, the length measured along a longitudinal axis of the second fastener, the second fastener having a plurality of straight edges. At least one of the plurality of straight edges prevents the second fastener from rotating further than a closed position when the at least one of the straight edges abuts a sidewall of an elongated slot in the firearm.

An accessory mounting interface for a firearm, and a related method, are disclosed. The interface has a firearm accessory, a first elongated fastener, and a second fastener rotationally mated to the first elongated fastener. The first elongated fastener has right-handed threading and is arranged through a through hole in the firearm accessory with a first end extending below first and second halves of a first slot protrusion of the firearm accessory. The second fastener has a length greater than a width, the length measured along a longitudinal axis of the second fastener, the second fastener having a plurality of straight edges. At least one of the plurality of straight edges prevents the second fastener from rotating further than a closed position when the at least one of the straight edges abuts a sidewall of an elongated slot in the firearm.

A firearm cable fastening device having a top side portion, one or more than one edge portion perpendicular to the top side portion, one or more than one attachment means for attaching the firearm cable fastening device to a firearm rail system, and one or more than one cable pass through indent.

A firearm cable fastening device having a top side portion, one or more than one edge portion perpendicular to the top side portion, one or more than one attachment means for attaching the firearm cable fastening device to a firearm rail system, and one or more than one cable pass through indent.

Provided is a tourniquet holder comprising a mounting base adapted to be operationally engaged with a handguard of an associated weapon, a first tang, a second tang, and an elongated retention strap. The mounting base has a substantially flat plate defining a first base face and a second base face, one or more fastener apertures, and one or more retention slots. The first tang extends in a direction substantially normal to the first base face. The second tang extends in a direction substantially normal to the first base face. The first tang and the second tang define therebetween a margin adapted to accommodate therein an associated tourniquet. The elongated retention strap passes through the one or more retention slots, has a first end and a second end that are selectably engagable with one another to define a loop adapted to retain therein the associated tourniquet.

Provided is a tourniquet holder comprising a mounting base adapted to be operationally engaged with a handguard of an associated weapon, a first tang, a second tang, and an elongated retention strap. The mounting base has a substantially flat plate defining a first base face and a second base face, one or more fastener apertures, and one or more retention slots. The first tang extends in a direction substantially normal to the first base face. The second tang extends in a direction substantially normal to the first base face. The first tang and the second tang define therebetween a margin adapted to accommodate therein an associated tourniquet. The elongated retention strap passes through the one or more retention slots, has a first end and a second end that are selectably engagable with one another to define a loop adapted to retain therein the associated tourniquet.

A targeting device for a firearm having a sighting device, the targeting device having a mount capable of being secured to the fire arm, and a camera capable of capturing images in a field of view including the sighting device, the camera being adjustable relative to the sighting device such that it can be aligned with the sighting device.

A targeting device for a firearm having a sighting device, the targeting device having a mount capable of being secured to the fire arm, and a camera capable of capturing images in a field of view including the sighting device, the camera being adjustable relative to the sighting device such that it can be aligned with the sighting device.