"...Constructed from a tubular steel body containing an explosive filler of Penthrite wax, a detonator, a direct action nose fuse, a delay friction igniter, and a base assembly containing a self-destroying system. A diaphragm near the bottom of the grenade is threaded centrally to receive the friction igniter. If the nose fuse does not function properly, the grenade becomes self-destructive On firing, the flash from the propelling cartridge enters a hole in the base closing plug and ignites a 6.5sec delay pellet contained in a brass holder. This fires the friction igniter which gives an additional delay of 4.5secs before setting of the detonator. A second model rifle grenade was also manufactured which could be used as a hand grenade simply by removing the base assembly and pulling a cord attached to the friction igniter...."