A barrel having a monolithic body comprising an elongate structure extending from a breach end to a muzzle end; a projectile bore extending from a projectile chamber to the muzzle end; one or more elongate recesses formed in the body, wherein each elongate recess is defined by an elongate hole extending from an open end formed proximate the muzzle end; a sleeve positioned around at least a portion of the barrel to encompass at least a portion of the barrel; and a radial ring, positioned between the barrel and the sleeve.

A firearm suppressor cover assembly and method of protecting a user while firing a weapon are disclosed. The cover assembly has an insulating cover assembly, a one or more clamps or other firearm suppressor attachment means, one or more standoffs per clamp, and an optional heat shield. The standoffs are coupled to the one or more clamps and in contact with the insulating cover assembly thereby forming an air gap between the suppressor and the insulating cover assembly. The heat shield may be arranged within the air gap.

A firearm suppressor cover assembly and method of protecting a user while firing a weapon are disclosed. The cover assembly has an insulating cover assembly, a one or more clamps or other firearm suppressor attachment means, one or more standoffs per clamp, and an optional heat shield. The standoffs are coupled to the one or more clamps and in contact with the insulating cover assembly thereby forming an air gap between the suppressor and the insulating cover assembly. The heat shield may be arranged within the air gap.

A firearm can have a bolt having a plurality of locking lugs that are configured to have a shear area that is larger than that of a standard M16/M4. A bolt carrier can have a bolt that has a double cut cam having an unlocking cam surface that has sufficient dwell increase to delay a start of unlocking when the bolt carrier is used in an M4 carbine. A stepped extractor pin may be provided that prevents disengagement of the extractor pin. A tube can be configured to provide gas from a barrel of the firearm to the piston via the carrier key. The tube can have a heat radiator formed from triangular shaped threads on at least a portion of the tube. A piston on the bolt and can have a plurality of rings including pairs of mating rings that are formed and maintained as a matched pair.

A firearm can have a bolt having a plurality of locking lugs that are configured to have a shear area that is larger than that of a standard M16/M4. A bolt carrier can have a bolt that has a double cut cam having an unlocking cam surface that has sufficient dwell increase to delay a start of unlocking when the bolt carrier is used in an M4 carbine. A stepped extractor pin may be provided that prevents disengagement of the extractor pin. A tube can be configured to provide gas from a barrel of the firearm to the piston via the carrier key. The tube can have a heat radiator formed from triangular shaped threads on at least a portion of the tube. A piston on the bolt and can have a plurality of rings including pairs of mating rings that are formed and maintained as a matched pair.

A barrel having a body including an elongate tubular structure extending from a breach end to a muzzle end; a projectile bore extending from a projectile chamber to the muzzle end; and a one or more tubular recesses formed in the body, wherein each tubular recess is defined by an elongate hole extending from an open end formed in an area proximate the muzzle end.

A barrel having a body including an elongate tubular structure extending from a breach end to a muzzle end; a projectile bore extending from a projectile chamber to the muzzle end; and a one or more tubular recesses formed in the body, wherein each tubular recess is defined by an elongate hole extending from an open end formed in an area proximate the muzzle end.

An M4A1 helically fluted gun barrel is provided which increases sustained peak temperature levels for the barrel. This M4A1 helically fluted gun barrel incorporates multi-start variable pitch helical openings into the exterior profile of a standard M4A1 heavy barrel. The helical openings increase the outer surface area for heat dissipation, and also reduce weight as a further advantage.

A sound suppressor for a firearm has one or more stacked baffles surrounded by an outer sleeve positioned such that an air gap exists between the baffles and the sleeve. The sleeve is connected to an outer portion of each of front and rear caps. The baffles are connected between the front and rear caps. The outer portions of the front and rear caps are disproportionately ventilated to induce directional air flow so as to facilitate heat dissipation.

Disclosed are systems and methods of rapidly cooling thermal loads by providing a burst mode cooling system for rapid cooling. The burst mode cooling system may include a complex compound sorber configured to rapidly absorb ammonia.