The Denel Vektor GA-1 is an automatic cannon based on the German WWII

MG 151/20 The ''Maschinengewehr'' (MG) 151 is a belt-fed autocannon for aircraft use, developed in Nazi Germany from 1934 to 1940 and produced by Waffenfabrik Mauser during World War II. It was originally produced in 15.1 mm caliber from 1940, with a ...

automatic cannon. Compared to other rapid-fire 20 mm autocannons, it is lightweight and has low recoil due to its design and the use of the

20×82mm The 20×82mm (sometimes 20×82mm Mauser) is a German 20 mm caliber Cartridge (firearms), cartridge developed during World War II for the MG 151/20 cannon. It continues to see usage today with the South-African Vektor GA-1 autocannon and Denel NTW ...

cartridge. The weapon was intended for use in vehicles, naval vessels, and helicopters. One gun was fitted to the Atlas XH-1 Alpha attack helicopter demonstrator.

References

Autocannon Cold War weapons of South Africa 20 mm artillery {{weapon-stub