This hopper-fed, loose-ammo loader eliminates hand fatigue and reduces magazine loading time by more than 50 percent. Simply load your ammo in the 50-round capacity hopper and let MagPump do the rest. The pump-action lever self-sorts ammunition in either direction, and loads up to 30 rounds in less than 30 seconds.Each 9mm Luger unit includes a mounting base plate and six adaptable retainers to fit pistol models:GLOCK, SIG, Smith & Wesson, Springfield Armory, CZ and Ruger.