A machine gun comprising a gun housing; a rotor assembly positioned within the gun housing; a barrel cluster including a plurality of barrels extending forward from the rotor assembly; one or more vents providing a path for expulsion away from the rotor assembly of gases emanating from a cartridge chambered in one of the plurality of barrels; and one or more of a rotor lock mechanism, a feed mechanism, a delinking and transfer mechanism, a searing mechanism, a drive system, a self-contained hardware barrel clamp, a threaded adapter barrel clamp, integrated mounts, and/or multiple feed inlet locations.

A barrel cooler includes a first shroud having a first sidewall and an aperture through a portion of the first sidewall. A second shroud includes a second sidewall and is configured to connect to the first shroud. The second shroud includes a plurality of openings through the second sidewall. A fan assembly is mounted to a bottom of the first shroud at the aperture. The fan assembly includes a fan and is configured to direct air through the aperture in the first shroud. A baffle plate is secured within the first shroud to a side of the aperture opposite the second shroud.

A barrel cooler includes a first shroud having a first sidewall and an aperture through a portion of the first sidewall. A second shroud includes a second sidewall and is configured to connect to the first shroud. The second shroud includes a plurality of openings through the second sidewall. A fan assembly is mounted to a bottom of the first shroud at the aperture. The fan assembly includes a fan and is configured to direct air through the aperture in the first shroud. A baffle plate is secured within the first shroud to a side of the aperture opposite the second shroud.