M230 chain gun
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The M230 Cannon is a 30 mm (30×113 mm), single-barrel electrically-driven autocannon, using external electrical power to cycle the weapon between shots. It was designed and manufactured originally by Hughes Helicopters in Culver City, California. As of 2019, it is produced by Northrop Grumman Innovation Systems.
An M230 Cannon mounted on a US Army AH-64 Apache at the Berlin Air Show 2018.
M789 HEDP 30 mm rounds being loaded into an AH-64D Longbow Apache in April 2007.
Oshkosh L-ATV in M1278 Heavy Guns Carrier JLTV configuration and fitted with an EOS R-400S-MK2 remote weapon system integrated with Orbital ATK's M230LF 30 mm lightweight automatic chain gun
30 mm caliber
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The 30 mm caliber is a range of autocannon ammunition. It includes the NATO standardized Swiss 30×173mm, the Soviet 30×155mmB, 30×165mm and 30×210mmB, the Czechoslovak 30×210mm, the Yugoslav 30×192mm, the British 30×113mmB, and the French 30×150mmB and 30×170mm cartridges.
Size comparison between 30×170mm and 5.56x45mm NATO
Soviet 30×165mm
The DU penetrator of a 30×173 mm round used in the GAU-8
French 30×150mmB