The Mag-Pump MP-AR15 Hopper Fed Magazine Loader dramatically reduces the time it takes to load any mil-sec AR-15 magazine. Simply dump loose ammo into the hopper no need to arrange or "pre-stage" the rounds insert your favorite magazine and start turning the handle. A safety system inside the Mag-Pump MP-AR15 Hopper Fed Magazine Loader prevents the rounds from being fed in the wrong orientation. The Mag-Pump MP-AR15 Hopper Fed Magazine Loader fills up magazines as fast as the user can crank the handle and keep a fresh supply of ammunition in the hopper. Reduces magazine loading time by more than 50% Loads .223 Rem, 5.56 NATO and .300 Blackout Mfg: Magpump, Llc.