MTM 4 Can Ammo Crate (AC4C)A rugged tactical carrying crate for multi caliber ammo storage and transport. Comes with four, O ring sealed 30 Caliber ammo cans(AC30T) for multi caliber ammo storage. 30 Caliber ammo cans are a convenient size to store all types of bulk ammo. The only problem is, that they are easier to knock over than the larger ammo cans. Now you can stack them as tall as you want in these specialized crates. Made of rugged polypropylene to last. Stackable and