The Caldwell AR-15 Mag Charger Ammo Box is optimized to drop ammo into the Caldwell AR-15 Mag Charger. The lid is removable and nests with the bottom cavity. This ammo box holds 50 rounds of .223, 5.56 x 45, and .204. The durable polymer is designed to be extremely tough and is great for long term storage. Optimized to drop ammo into the Caldwell Mag charger Lid is removable and nests with the bottom cavity Durable polymer designed to be extremely tough Great for long term storage