(Packing Crate): 1.5 Cubic Feet. 20mm High Explosive - Incendiary M97 (T23) Weight (Projectile): Weight (Complete Round): each. Weight (Packing Crate):. Volume (Packing Crate): 1.5 Cubic Feet. 20mm Training-Practice M99 (T24) Weight (Projectile): Weight (Complete Round): each. Weight (Packing Crate):. Volume (Packing Crate): 1.5 Cubic Feet. See also Hispano-Suiza HS.820 MG FF cannon ShVAK cannon Nkm wz.38 FK References War Department Training Manual TM 9-227 20mm M1 Automatic Gun & 20mm AN-M2 Automatic Gun (November 19, 1942). External links 20 mm artillery Aircraft guns Autocannon World War II weapons of France World War II weapons of the United Kingdom World War II weapons of the United States Military equipment introduced in the 1930s