Type BB machine gun Used by USAAF
US Navy | Place of origin United States Sights Iron | |
The Palmer BB Machine Gun is a training weapon capable of firing ball bearings.
During World War II, the USAAF and US Navy used thousands of Palmer BB machine guns to hone the skills of aerial gunnery. This much larger gun is cycled by an electric solenoid and powered by compressed air. The air pressure is higher, at 180-200 psi, but the velocity runs between 500 and 600 f.p.s.
References
Palmer BB Machine Gun Wikipedia(Text) CC BY-SA