A standard-issue multipurpose 22mm rifle grenade. After testing with underbarrel grenade launchers, it was decided to employ rifle grenades, since although they are heavier, they can use a service rifle and are more powerful. To operate the weapon, simply place grenade over service rifle flash hider and fire. The grenade at that point will be armed by the impact of the bullet into the base. Detonation is through a piezoelectric crystal fuse similar to that on an M72 LAW. It does not require a special blank cartridge, and can be fitted over the flash hider of an M4/M16 rifle with no modifications.

Of note, the stated caliber (22mm) is not the diameter of the warhead, but the internal diameter of the portion which is fitted over the rifle's flash hider.