The Mag Pump loader is a hopper fed, loose ammo loader that elimnates that hand fatiuge and cuts the time in half to load a magazine. Simply load your ammo in a 50 round capacity into the hopper and let Mag Pump do the rest. The pump action lever self sorts the ammunition in either direction, and loads up to 30 rounds in 30 seconds. Each kit comes with a mounting base plate and six adaptable retainers to fit pistol models: Glock, SIG, S&W, Springfield, CZ and Ruger.