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Cartridge, 40 mm, multiple projectile, M576
Region
United States
Category
Ammunition, Missiles and precision weapons
Armament Low-velocity grenade launchers of the M79 and M203 types. Development US Army Ordnance. Description This cartridge is intended for use in counter-insurgency and conventional operations in jungle environments, particularly during periods of poor visibility where personnel targets appear at short distances without warning and are vulnerable only fleetingly. The cartridge is a fixed round of ammunition consisting of a multiple projectile assembly and a cartridge case assembly. The projectile assembly
includes a polyethylene sabot carrier with one centre cavity and several smaller cavities around the outside perimeter. A plastic pellet cup filled with 20 metal pellets is fitted into the centre cavity and is covered by a snap-on cap. The outer cavities act as air scoops. An obturator on the rear of the sabot serves as a propellant gas seal between the cartridge case and the sabot. The projectile assembly is crimped into the cartridge case. The case is a hollow bi-chambered cylinder with a metal closing plug crimped into the open well of the propellant chamber in the cartridge base. The propellant chamber acts as a high-pressure chamber and has 10 vent holes in the top sealed by a copper disc. The upper hollow cavity in the case serves as a low-pressure chamber. A percussion primer is crimped into a centre opening in the closing plug. Manufacturer US government contractors.