RM is a world-class manufacturer of 40mm grenade launchers and accessories. Our M203PI 40mm modular grenade launcher is standard issue to forces in the U.S. and dozens of countries. The M203PI grenade launcher fits all modern military rifles & is also a small standalone launcher. (NSN 1010-01-393-0656). RM makes the M203grip vertical grip for all M203 grenade launchers. (NSN 1010-01-579-0712).