Bushmaster Chain Gun

Manufacturer: Orbital ATK  
Product type: Weapons & Weapon Systems  
Name: Machine gun  

The 7.62mm Bushmaster Chain Gun, originally developed for coaxial use and the smallest member of the Chain Gun family, is a rugged, highly-reliable, combat effective weapon readily adaptable to various machine gun roles. By design, it provides the optimum solution to combat the normal feed problems associated with most present-day gas operated small caliber machine guns, but with proven Bushmaster reliability.

Like the 25mm M242 automatic cannon, the 7.62mm Bushmaster Chain Gun ejects fired cases, including the retained gases, forward (outboard) and capitalizes on long bolt-dwell time to minimize gas buildup in all cupola or turreted installations. Toxic gas emission within the vehicle during firing has been proven to be less than 5 percent of that found with contemporary, gas-operated coaxial weapons.

For coaxial installation, the weapon is configured to permit barrel change in less than 10 seconds without downloading ammunition. Barrel jacket configuration can be varied to suit the needs of the specific installation and all jacket designs provide for the quick-change barrel feature.

The Bushmaster Chain Gun offers exceptional reliability and combat availability several orders of magnitude better than any comparable weapon of this caliber.

The Bushmaster Chain Gun fires 570 rounds per minute of NATO standard 7.62mm ammunition.

Key System Attributes

  • 95 percent reduction of toxic propellant gases compared to a standard M240 mounted co-axial position

  • Reduced inboard intrusion with turret volume requirement of no more than 11 inches/28cm (length) x 6 inches/15cm (height) x 6 inches/15cm (width)

  • Misfire stoppages eliminated with electrical extraction of the unspent cartridge

  • Ejection of spent cases forward of the gun trunnions (not collected in a bag inside the turret)

  • Belt-pull in excess of link strength

  • Electrically driven bolt resulting in immediate and consistent rounds-per-minute firing

  • Zero carbon build-up on (in) moving parts

  • Swap-out (exchange) of barrel assembly without removing the weapon system from its co-ax mount

  • Options include: long or short barrel jacket/shroud

Property Value
Main weapon caliber (mm)
Rate of fire (rds/min)
Weight (kg)
Length (mm)
Width (mm)
Height (mm)
Barrel length (calibres)
Muzzle velocity (m/s)

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Bushmaster Chain Gun