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Japanese 20mm Mauser MG 151/20 Cannon


Photograph of Mauser 20mm cannon

U.S. Navy. Via Francillon (1979)


Specifications


Weight of round     
115 g or 4.06 ounce (HEI or AP)
Velocity 2500 feet per second
762 meters per second
Range 2790 feet
850 meters
Rate of fire     
800 rounds per minute
Weight of gun
93 lb
42 kg
Gun power
204


This was actually a German cannon, of which 400 were imported. They were all used on the Ki-61-I "Tony."

The gun used a recoil action and was fed from belts of 140 rounds. It was the most successful German 20mm gun and was based closely on the MG 151 15mm gun. It was available in both percussion and electrically fired variants, but those delivered to Japan were apparently of the electrically fired kind.

Armor penetration was about 0.47" to 0.51" (12 to 13 mm) at 330 yards (300 meters) and 30 degrees.

References

Francillon (1979)
Williams and Gustin (2003)



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