Patent Document ID: 9194675
Application ID: 14589326
Patent Flag: 1

Claim One:
1. In an ammunition round, a full in-bore 40 mm projectile configured for firing from an M203 or and M320 grenade launcher without incurring any spin on said projectile imparted by said M203 or M320 grenade launcher during launching, the projectile comprising: a projectile body having a diameter; a nose section; and a stabilizing folded aft tail assembly attached at the rear of the projectile body wherein the folded tail assembly is configured to unfold in flight after launching; the projectile further including a rear holding cup assembly attached to the projectile body via a snapped on, spinnable connection, the rear holding cup having the same outside diameter as the projectile body, wherein the rear holding cup assembly cups over said folded aft tail assembly, the rear holding cup assembly further including a free spinning rear obturator thereon and a rear closure thereon, the rear closure having venting holes therein; the projectile further includes a free spinning front obturator on the projectile body and a rear cartridge case attached to the rear holding cup assembly; wherein the outside diameter of the holding cup assembly and the projectile body are less than the outside diameters of the front and rear obturators and of the rear cartridge case; wherein during launch of the projectile, the rear holding cup assembly becomes internally pressurized through the venting holes and wherein upon exit of the projectile from the launcher, the rear holding cup assembly is expelled off of the folded aft tail assembly to allow said folded aft tail assembly to unfold.