The GAU-15/A, formerly identified as the XM218, is a lightweight member of the M2/M3 family. The GAU-16/A was an improved GAU-15/A with modified grip and sight assemblies for similar applications. Both of these weapons were used as a part of the A/A49E-11 armament subsystem (also known as the Defensive Armament System).

GAU-18/A（前稱XM218），是M2／M3的美國空軍輕量化型號，安裝在MH-53J Pave low II及HH-60鋪路鷹直升機上。 GAU-18/A沒有採用重槍管，並從 機匣 左面供彈，右面排出彈殼。

2025年2月17日 · GAU-18/A（前称XM218），是M2／M3的美国空军轻量化型号，安装在MH-53J Pave low II及HH-60铺路鹰直升机上。 GAU-18/A没有采用重枪管，并从 机匣 左面供弹，右面排出弹壳。

2011年4月15日 · The GAU-21/A is also being used by the United States Marine Corps to upgrade from the XM218 .50 cal. machine gun for the CH-53E. The M3M flexible machine gun has been adopted by USN under the...

GAU-15/A (XM-218) Cal. 50 Machine Gun. The GAU-15/A utilized on the H-46, UH-1N and H-53 series aircraft is a crew served, recoil operated, belt fed, air cooled, percussion fired weapon, with a rate of fire of 750 rounds per minute.

2011年7月7日 · XM218 .50 Caliber Machine Gun. The GAU-15/A .50 caliber is a crew served, recoil operated, belt fed, air cooled, percussion fired weapon, with a rate of fire of 750 rounds per minute.

The GAU-15/A, formerly identified as the XM218, is a lightweight member of the M2/M3 family. The GAU-16/A was an improved GAU-15/A with modified grip and sight assemblies for similar applications. Both of these weapons were used as a part of the A/A49E-11 armament subsystem (also known as the Defensive Armament System).

GAU-18/A（前称XM218），是M2／M3的美国空军轻量化版本，安装在MH-53J Pave low II及HH-60铺路鹰直升机上。 GAU-18/A没有采用重枪管，并从机匣左面供弹，右面排出弹壳。

– XM218 and GAU 21/A were introduced Initial testing revealed the cartridge could not endure the higher rate of fire aircraft weapons – Projectile setback in cartridge case – Case separation at the joint between the brass cap and polymer caselet. » Case separation caused by combustion gases entering the interface