50 Caliber BMG Ammo Box Features The BMG20 is the MTM Mini Ammo Can with a die cut military spec foam insert to hold 20 rounds of 50 BMG and other similar size rounds. Molded out of rugged polypropylene plastic and will hold up to years of service. Utilizing MTM s tongue and groove O-Ring seal system for a superior water-resistant seal Non-submersible. Double padlock tabs along with molded-in stacking ridges make these solid containers the perfect solution for your 50 BMG storage needs. Made in the USA 50 Caliber BMG Ammo Box Specifications round in bullet up position. Compact design holds each round by the base in miltary spec foam. Water-resistant O-ring seal for dry storage; Non-submersible Stackable design and double padlock tabbed for security Max. OAL= 4.9 - Hole Diameter = .82" Lockable. Carrying handle