US Cartridge, 20mm API, M53
The cartridge is used against armored targets, and functions with a combined incendiary and penetrating effect.
The body of the projectile is a solid shot made from bar alloy steel. The nose of the projectile is made from aluminum alloy and is charged with three increments of incendiary composition. The projectile is painted black with red band and red markings.
Nothing else to see.