Prvi Partizan PPB739: PPU manufactures many calibers of brass cased blank cartridges. Most are \"full cased\" which means they have an extended case shaped similar to a loaded round. This provides reliable functioning in all types of weapons. This 7.62x39 blank comes in a pack of 15 rounds per box, 96 boxes per case. Note: A correct blank firing adapter must be used on the gun to ensure semi-automatic operation.