The SIG-MMG 338 is a medium machine gun developed by SIG Sauer, designed primarily for use by special operations forces and the United States Army. Type: Medium machine gun. Origin: United States. Manufacturer: SIG Sauer. Caliber: .338 Magnum standard, with the ability to be converted to fire 7.62×51mm ammunition. Weight: Approximately 10 kg (22 lb) Length: 1,300 mm (50 in) Barrel length: 610 mm (24 in) Operating system: Short stroke gas piston. Rate of fire: 600 rounds per minute. Exit velocity: 810 m/s (2,650 ft/s). Effective range: 1,700 meters (1,700 yards). Maximum range: 5,640 meters (5,640 yards). Feeding system: 50 or 100 cartridge belt. Additional characteristics: Fully ambidextrous, with automatic and semi-automatic firing configurations, and equipped with a next generation suppressor (NGS) manufactured by SIG Sauer 1 2. This machine gun was developed to fill the gap between medium and heavy machine guns, providing superior range and penetrating power to 7.62 mm caliber machine guns, but with significantly less weight than .50 caliber machine guns.