US Cartridge, 81mm Illuminating, Infrared (IR), M816 with Fuze, MTSQ, M776
This cartridge is an Infrared (IR) Illuminating round developed for use in the 81mm M252 Mortar System to take advantage of the night vision device and reduce friendly forces exposure to the enemy.
The complete round consists of an MTSQ fuze with an expulsion charge, a body tube and tail cone assembly containing an Infrared (IR) illuminant charge and a parachute assembly. The ignition cartridge with integral percussion primer is assembled to the end of the fin assembly. The propellant charge is contained in four horse-shoe type propellant increments which are assembled around the fin assembly shaft
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