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This cartridge consists of a PD (practice) fuze, hollow projectile body with vent holes, fin assembly, three plastic plugs (simulations of propellant charge increments), obturating ring and ignition cartridge with percussion primer. When the cartridge is loaded, it slides down the mortar tube until the primer in the ignition cartridge strikes the firing pin in the base cap of the mortar. The primer ignites the ignition charge and the gasses generated by the ignition cartridge propel the cartridge out of the barrel. The distance of the cartridge traveling downrange depends on the number of plastic plugs removed (before firing) and the amount of gas allowed to escape from the barrel through the projectile body. The fuze functions on impact with the ground or target. A pyrotechnic smoke cartridge in the fuze produces a flash, an audible sound, and a cloud of smoke.
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