A suppressor for a firearm barrel and a barrel guard includes a primary expansion chamber and a plurality of secondary expansion chambers comprising a volume of the firearm suppressor. A plurality of fins formed into an exterior wall of the suppressor is in an intimate contact with the barrel to increase a heat transfer to an atmosphere around the suppressor. A additionally plurality of ribs is formed into the volume of the suppressor to increase a heat transfer therefrom. A plurality of holes is configured along the barrel guard to penetrate the barrel guard and promote atmospheric cooling of the barrel and the suppressor.

A cooling device uses an endothermic chemical reaction for cooling. The cooling device includes a sealed casing with at least two reagents that generate an endothermic chemical reaction when they come into contact. The cooling device further includes a separating membrane separating the reagents in a storage position; a contact-making system which can be activated and configured to bring the reagents into contact with one another when activated, an interface element for activating the contact-making system; and a thermal interface with a thermally conductive metal base plate. One of the surfaces of the base plate is subjected to the endothermic chemical reaction, and the other surface of the base plate is accessible from outside the cooling device.

A charging handle includes a shaft, a front end that is operably coupled to a firearm bolt carrier, and a head that is located on an opposite end of the shaft from the front end. One or more ventilation features may be located in a first half of the length of the shaft proximate to the front end of the charging handle to prohibit exhaust that travels from the front end along the upper surface and/or side surfaces of the shaft from reaching the rear of the firearm and/or the head of the charging handle.

A charging handle includes a shaft, a front end that is operably coupled to a firearm bolt carrier, and a head that is located on an opposite end of the shaft from the front end. One or more ventilation features may be located in a first half of the length of the shaft proximate to the front end of the charging handle to prohibit exhaust that travels from the front end along the upper surface and/or side surfaces of the shaft from reaching the rear of the firearm and/or the head of the charging handle.

A disclosed firearm suppressor includes a fully over the barrel (FOTB) relation between the suppressor and a barrel and a barrel guard of the firearm wherein the suppressor comprises a primary expansion chamber and a plurality of secondary expansion chambers comprising a volume thereof. The disclosure also includes a plurality of fins formed into an exterior wall of the suppressor in an intimate contact with the barrel to increase a heat transfer to an atmosphere around the suppressor. The disclosure additionally includes a plurality of ribs formed into the volume of the suppressor to increase a heat transfer therefrom. The disclosure further includes a plurality of holes configured along the barrel guard to penetrate the barrel guard and promote atmospheric cooling of the barrel and the FOTB suppressor.

Weapon barrels are disclosed which offer improved thermal performance and rigidity with no, minimal or negative weight increase. In general the barrel comprises a barrel core surrounded by a lightweight, thermally conductive sleeve made from metal-matrix composite (MMC) materials, also referred to as metal-matrix material. The increased diameter of the sleeve improves the barrel's stiffness and the sleeve's thermal conductivity and distributes the heat more evenly along the barrel. Manufacturing and joining techniques are disclosed as well as materials and material combinations that allow the barrel to perform at high cadence over the whole temperature range the barrel is used. Hot spots may be reduced and more surface area can contribute to heat dissipation. The increased diameter also allows integration of phase changing and/or vibration dampening materials, which further enhance performance.

Methods for directing a casing are provided. The method can include firing a firearm. The firearm can comprise an upper receiver having a bore disposed therein. The bore can extend along a longitudinal axis of the upper receiver. The upper receiver can also include an ejection port disposed through a first side of the upper receiver. The upper receiver can also include a deflector extending from the upper receiver at a first end of the ejection port. The deflector can be designed to direct the casing in a forward direction.

A cooling device uses an endothermic chemical reaction for cooling. The cooling device includes a sealed casing with at least two reagents that generate an endothermic chemical reaction when they come into contact. The cooling device further includes a separating membrane separating the reagents in a storage position; a contact-making system which can be activated and configured to bring the reagents into contact with one another when activated, an interface element for activating the contact-making system; and a thermal interface with a thermally conductive metal base plate. One of the surfaces of the base plate is subjected to the endothermic chemical reaction, and the other surface of the base plate is accessible from outside the cooling device.

Representative implementations of devices and techniques provide a cooling system for an implement holster (such as a handgun holster, for example). In various embodiments, the cooling system provides fluid flow through at least a portion of the holster to cool the holster and the user. For example, the cooling system includes a cooling assembly adapted to move a fluid through a ducting layer of a multi-layer holster backer.

Representative implementations of devices and techniques provide a cooling system for an implement holster (such as a handgun holster, for example). In various embodiments, the cooling system provides fluid flow through at least a portion of the holster to cool the holster and the user. For example, the cooling system includes a cooling assembly adapted to move a fluid through a ducting layer of a multi-layer holster backer.