Prvi Partizan PPB9L: 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 9mm Luger blank comes in a pack of 50 rounds per box, 20 boxes per case. Note: A correct blank firing adapter must be used on the gun to ensure semi- or full automatic operation.