The Profense PF 50 is a 12.7 mm electrically driven (non gas-operated) chain gun produced by Profense LLC, with a maximum rate of fire of 650 rpm. This weapon is very similar to the M2HB machine gun, however it differs in operation system. It works with an electric motor as on the Bushmaster gun produced by ATK.^[1] The Profense PF 50 features a digital, programmable, variable rate Gun Control Unit (GCU). It can also be configured to single shot sniper mode, with optical sight mount. It can be installed on helicopter, naval vessels, wheeled vehicles, unmanned vehicles, aircraft, and remotely operated weapon stations.^[2]

PF 50 chain gun
PF 50 in AUSA 2015
Type	Chain gun
Place of origin	USA
Production history
Manufacturer	Profense, LLC
Produced	2015–present
Specifications
Mass	34.47 kg (76.0 lb)
Length	1,524 millimetres (60.00 in)
Barrel length	802 millimetres (31.57 in)
Width	254 millimetres (10.00 in)
Height	225 millimetres (8.86 in)
Cartridge	12.7x99mm NATO
Caliber	12.7 mm (0.5 in)
Barrels	1
Action	External electric power
Rate of fire	Variable, 450/550 rpm with burst limiter, 650 rpm max
Feed system	12.7 mm NATO M9 linked ammunition belt
Sights	Mount for optical sights provided