Patent ID: 9010248
Filing Date: 2015-04-21
Classification: F41A,F42B

Abstract:
1. A 40 mm ammunition round for firing in an M320 grenade launcher, said round being launched without spinning of said round, the round comprising: a high explosive 40 mm projectile, a hollow cylindrical shaped gun sleeve cartridge case further including an enclosed aft wall section, said aft wall section having a bowl area therein sized for receiving a propellant closure cup, said propellant closure cup positioned fore of a base plug threaded into the rear of said cartridge case, said closure cup fully loaded with propellant powder therein, and wherein said propellant closure cup further contains an overlapping lip that mates with said base plug to prevent propellant from leaking through any aft wall vent holes to inside the cartridge case's interior area, and wherein said projectile is inserted into said cartridge case in a direction with aft end of said projectile fore of said closure cup so that said projectile may be pressed into, and fully inserted into, said cartridge case.