Simply put, the Caldwell AR Mag Charger revolutionizes the way ammo is handled and loaded into AR-15 magazines. It is designed to accept 50 loaded rounds directly from any common 50 round ammo manufacturer box or from aftermarket 50 round plastic storage boxes. Simply align bullet tips and dump a box of ammo into the Mag Charger. The ammo is automatically aligned without touching a single round. Once filled with ammo, insert any AR magazine into the Mag Charger just as you would into a rifle. Then actuate the plunger back and forth loading 5 rounds per stroke as the spring loaded ammo carrier automatically advances aligning the next five rounds until magazine is fully loaded.