The GAU-19/A (GECAL 50) is an electrically driven, three-barrel rotary heavy machine gun that fires the .50 BMG (12.7×99mm NATO) cartridge. The GAU-19/A is designed to accept standard NATO .50 caliber M9-linked ammunition. The rate of fire is selectable to be either 1,000 or 2,000 rounds per minute.

The M2 machine gun or Browning .50 caliber machine gun (informally, " Ma Deuce ") [13][14] is a heavy machine gun that was designed near the end of World War I by John Browning.

The Minigun is used by several branches of the U.S. military. Versions are designated M134 and XM196 by the United States Army, and GAU-2/A and GAU-17/A by the U.S. Air Force and U.S. Navy.

The FN® M3M (GAU-21) is a .50 caliber (12.7x99mm) single barrel rapid-fire machine gun suitable for rotary-wing aircraft applications providing defensive firepower ranging out to nearly 2000 meters. The FN M3M™ was designated by the U.S. Navy as the GAU-21 in 2004.

The GAU-21 .50 caliber weapon system includes: a pintle mounted .50 caliber machine gun with an open bolt design, the capability to use 100, 300 or 600 round ammunition cans, the capability to fire all standard NATO .50 caliber ammunition, the ability to maintain or increase the available fields of fire for each airframe, and the capability for ...

Aug 18, 2004 · The 7.62mm Aircraft Machine Gun, identified in the U.S. military inventory as the "M-134" (Army), "GAU-28/A" (Air Force), and "GAU-17/A" (Navy), is a machinegun as defined by 26 U.S.C. 5845(b). Rev. Ruf. 55-528 modified.

The 0.30 caliber (7.62 mm) GAU-2 version was first deployed by the Air Force for use on light aircraft and helicopters, but has since been adopted by the Army, Marines and Navy for the same purposes. These guns are widely used, with the U.S. …

Next-generation, battlefield-proven weapons of excellence, firing 30x173mm advanced ammunition. The Mk44 Bushmaster® Chain Gun® automatic cannon arms ground and naval platforms and is also capable of firing the new Northrop Grumman programmable air burst munitions (Mk310).

The 7.62mm Aircraft Machine Gun, identified in the U.S. military inventory as the "M-134" (Army), "GAU-2B/A" (Air Force), and "GAU-17/A" (Navy), is a machinegun as defined by 26 U.S.C. 5845 (b). Rev. Rul. 55-528 modified.

A light machine gun (LMG) is a light-weight machine gun designed to be operated by a single infantryman, with or without an assistant, as an infantry support weapon. LMGs firing cartridges of the same caliber as the other riflemen of the same combat unit are often referred to as squad automatic weapons .