20mm Hispano-Suiza HS.820 with left hand single feed mechanism.
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The Hispano-Suiza HS.666A twin gun mount is armed with two HS.820 autocannon. This was renamed GAI-D01 with KAD autocannon after acquisition by Contraves.
The West German SPz 12-3, also known as HS-30 or Schützenpanzer Lang, is armed with a HS.820 autocannon in a one man turret. A total of 2.000 rounds are carried for this gun.
The M3 VDAA is fitted with a TA-20 turret developed by Hispano-Suiza with two HS.820 autocannon. Since all production took place after sale to Contraves, all are fitted with the renamed KAD autocannon.
The VAB VDAA is fitted with the same TA-20 turret as used on the M3 VDAA.
The HS.820 is a downscaled version of the 30mm HS.831 design.
The German Rh-202 autocannon fires the same 20x139mm ammunition as the HS.820.
The French M693 autocannon fires the same 20x139mm ammunition as the HS.820.
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