The 40mm M397 cartridge is a low-velocity "Jump-Up" fragmentation grenade fired from 40mm hand-held grenade launchers such as the M203 or M320. The grenade has a delayed high explosive assembly that is ejected from the grenade on impact and detonates five feet above the impact point. This creates an airburst like effect that allows for better distribution of the grenade's fragments. A similar Russian grenade, the VOG-25P, is used for the GP-30. It also uses a small charge to eject the HE assembly in the nose into the air before a delayed detonation.