US Cartridge, 40mm Parachute Star, XM583, M583A1, XM661, M661, XM662, M662
These cartridges are designed for illumination and signaling with less weight and bulk and greater accuracy than comparable handheld signals. They are fired from 40mm Grenade Launchers M79 and M203 (attached to the M16 series rifle).
The cartridge is a fixed round of ammunition consisting of a projectile assembly and a cartridge case assembly. The projectile has a one piece, hollow aluminum body with a metal rotating band. A plastic ogive, embossed with a raised letter for night identification of payload, is snapped into an O-ring in the front opening of the projectile cavity. The cavity contains a pyrotechnic flare candle assembly, and an integral ignition/ejection charge attached to a 20 inch diameter parachute. The projectile has a 4 to 5 second delay ignition element crimped into the center opening of a metal delay carrier. The projectile is press fitted into an O-ring in the front opening of the cartridge case. The case is a hollow bichambered cylinder with a metal closing plug crimped into the base of the cartridge case. The propellant cup is sealed on the bottom by the closing plug. The cup acts as a high-pressure chamber, and the cavity in the case surrounding the cup acts as a low-pressure chamber. A percussion primer is crimped into a center opening in the closing plug.
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Collaborative Ordnance Data Repository