The 5.56×21mm PINDAD was a personal defence weapon round previously developed in Indonesia. The round is based on the 5.56×45mm NATO cartridge, being a cut down version of it. Development The 5.56x21mm round is said to have the same firepower from a .40 S&W or 10mm round. Platforms using this cartridge Pindad PS-01 References Pistol and rifle cartridges 5.56 mm firearms