These cartridges are used to provide aerial identification and location of troops on the ground and are designed to be fired from 40mm Grenade Launchers M79 and M203 (attached to the M16 series rifle).
The cartridges consist of a cartridge case, a projectile with pyrotechnic smoke payload, and a pyrotechnic impact fuze. The cartridge case is a dual chambered aluminum container housing a brass propellant cup. The propellant cup is held in the case by a crimped base plug which provides a pressure type waterproof seal. The base plug houses a percussion primer. The projectiles utilize a one piece aluminum body ogive and a steel base. The payload consists of a pyrotechnic smoke mixture pressed into the body ogive with a cylindrical cavity in the center. The fuze is cemented to the base of the projectile and protrudes into the cylindrical cavity of the smoke mixture. The fuze is designed to arm at a minimum of 15 meters and a maximum of 45 meters from the muzzle of the weapon.
Filler - Smoke mixture (75 g, 2.68 oz)
M118 cartridge case
Propellant - M9, 330 mg
Primer - Percussion FED 100
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