 It can be useful in ambushes and other fast-paced close combat situations.While MM-1 looks much like a Milkor MGL grenade launcher with a larger cylinder, it was adapted from the Manville machine projector, a revolver-type 18-shot tear gas gun, developed in USA for police use before the Second World War.Michael Rogak, maker of the Rogak P-18 pistol, upsized the Manville design to 40mm and made certain design changes.