Description
Cartridge, 40mm: High Velocity Canister Cartridge (also known as HVCC or the 40mm Canister Cartridge) is used against personnel out to 100 meters from the weapon. It is used with the Mk 19 Mod 3 Grenade Machine Gun (GMG).
The cartridge is a fixed round of ammunition consisting of a projectile assembly and a cartridge case assembly. The projectile has an aluminum sabot body with 113 steel flechettes, an aluminum nose cap, a pusher cap, valve plate, spring, bore rider retaining disk, rubber pad, obturator and an expulsion charge. The cartridge case is aluminum with a high pressure and a low pressure chamber and a percussion primer.
Functioning
When the firing pin of the Mk 19 Mod 3 GMG strikes the percussion primer, propellant gases in the high-pressure chamber blow through vent holes into the low-pressure chamber to propel the projectile forward. Propellant gas is bled into the base of the canister projectile through a hole in the bottom of the sabot body. The force of the gas acting on the valve plate pushes it forward against a spring and opens the plenum chamber. Propelling gas ignites the expulsion charge located in the plenum chamber and expulsion charge gas pushes the valve plate closed and pushes the pusher cup forward. The pusher cup is loaded with a quantity of 113 flechettes. The forward motion of the pusher cup and the flechettes releases the nose cap. Once the nose cap is released, the pusher cup and flechettes are free to deploy. No parts of the canister projectile are left in the bore of the Mk 19 Mod 3 GMG after firing.
Hazardous Components
Filler - 113 steel flechettes
Cartridge case - M169
Propellant - M2
Primer - Percussion, FED 215
Expulsion charge - WC231 Ball powder
Physical Data
Length, overall - 4.39 in, 112 mm
See Also
Nothing else to see.
Source(s)
