The 20 mm x 139 Multipurpose ammunition with tracer and self-destruct device is designed to defeat a broad spectrum of targets, ranging from all kinds of soft skinned air and ground targets up to light armored and semi-hard targets. The tracer gives the shooter target correction information and the self-destruct device minimizes the risk for collateral damage. The hardened steel body with explosive filling gives significant penetration, blast, incendiary and fragmentation effects. The pyrotechnical initiation chain gives a natural delay ensuring all effects are delivered inside the target.