MTM Case-GardTM introduces an all new way of storing ammo boxes. MTM Ammo Racks will change and improve the way you organize ammunition. Features: Racks may be stored standing, stacked flat, or hung on a wall Ideal for maximizing gun safe storage Shelves are adjustable for different combinations Four holes molded into the back for secure mount to wall ARRS comes with four RS-50 ammo boxes for storage of 200 rounds of 223, 204, 5.56x45 or 6x47 ammo.