The MEI Hellhound 40 mm low-velocity multi-purpose grenade is a fixed-type munition designed to be fired from a
40×46mmgrenade launcher such as the
M79,
M203,
M320 (attached to the
M16 series of rifles or
M4 carbine), or
Milkor MK-1.[1][2] The round consists of a metal
projectile body, a
fuze, and a cartridge case assembly. Upon impact with the target, the
firing pin is driven into the
detonator, which in sets off the round, producing a jet which sets off the explosive from the base forward. This results in an armor-piercing jet of molten metal and
fragmentation of the projectile body.[3] The MEI Hellhound uses the same
high-low propulsion system as other 40 mm grenade launchers.[4]