TRZ Trading Inc. PPU Blank Rifle Ammunition 5.56 M200 Blanks 20/ct. Most are full cased types i.e. they have an extended case shaped similar to a loaded round. This provides reliable functioning in all types of weapons. Please note that correct blank firing adapter must be used on the gun to ensure semi or full automatic operation. Package Contents: PPU Blank Rifle Ammunition PPU manufactures many calibers of brass cased blank cartridges. Most are "full cased" types i.e. they have an extended case shaped similar to a loaded round. This provides reliable functioning in all types of weapons. Please note that correct blank firing adapter must be used on the gun to ensure semi or full automatic operation. PPB51