Bushmaster Chain Guns
Superior, effective chain guns protecting the warfighter today and beyond.
![30x173mm Bushmaster® Chain Guns® tank using 30x173mm Bushmaster Chain Guns](https://cdn.northropgrumman.com/-/jssmedia/wp-content/uploads/30x173mm-Bushmaster-Chain-Guns-hero-001.jpg?mw=3840&rev=bdc89da8bf2c44fba8239e5fc283dd69)
30x173mm Bushmaster® Chain Guns®
Next-generation, battlefield-proven weapons of excellence, firing 30x173mm advanced ammunition.
![The Mk44 Bushmaster® Chain Gun® automatic cannon tank with The Mk44 Bushmaster® Chain Gun® automatic cannon](https://cdn.northropgrumman.com/-/jssmedia/wp-content/uploads/Bushmaster-Mk44-chain-gun-001.jpg?mw=3840&rev=f236c53fddba43b58be0c1fef1ce2814)
Mk44
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 Bushmaster Mk44S arms ground and naval platforms The Mk44S arms ground and naval platforms](https://cdn.northropgrumman.com/-/jssmedia/wp-content/uploads/Bushmaster-Mk44S-arms-ground-and-naval-platforms-001.jpg?mw=3840&rev=205128d8c23049d7bfbfc2fe68cc6f38)
Mk44 Stretch
The Mk44S arms ground and naval platforms with superior overmatch with the ability of firing 30x173mm ammunition and can upgrade to fire 40mm Super Forty Ammunition in the field.
![XM813 Bushmaster chain gun tank with American flag and Bushmaster chain gun](https://cdn.northropgrumman.com/-/jssmedia/wp-content/uploads/xm813-Bushmaster-Chain-Gun.jpg?mw=3840&rev=68bbd119e5e7434eb8ea3f87ee2e19eb)
XM813
The XM813 is a variant of the Mk44S, adopted by the U.S. Army for use on the Stryker Dragoon infantry carrier vehicle 30mm Medium Caliber Weapon System program.
![GAU-23 Bushmaster chain gun military plane with GAU-23 Bushmaster chain gun](https://cdn.northropgrumman.com/-/jssmedia/wp-content/uploads/GAU-23-Bushmaster-chain-gun.jpg?mw=3840&rev=c423945104314fd088825ba8163b36f1)
GAU-23
The GAU-23 is the aircraft version of Mk44. It arms the U.S. Air Force AC-130J Ghostrider Gun Ship and U.S. Marine Corps Harvest Hawk.