Caldwell's AR-15 Mag Charger is designed to accept loaded rounds directly from any 50-round ammo manufacturer box or from aftermarket 50-round plastic storage boxes. The entire process of filling the Mag Charger and loading all 50 rounds into two magazines takes less than 15 seconds. The AR-15 Mag Charger includes an Ammo Transfer Tray to invert ammo positioned in boxes with the bullet tips down or to stage bulk ammo. Highly durable poly-carbonate construction, the Mag Charger is compatible with .223, 5.56 and .204 ammo.