Ammo Box Features All Berry's Ammo Boxes are made from high impact polypropylene for increased strength against cracking chipping warping expansion or contraction. Our Model #412 50 round boxes feature our traditional living hinge design providing a translucent look and an easy-to-open lid. They are stackable they carry a lifetime warranty and they are made in the USA. Ammo Box Specifications Berry s Mfg 412 Clear Ammo Flip Top Box Holds 50 Rounds .300 Ultra