This system has two key advantages: the grenade can generally be made larger and more powerful as compared to underbarrel or standalone weapons, and the rifle's weight and handling characteristics are not affected as with underbarrel systems. Many grenades have been designed to launch from a rifle's muzzle, usually using either a special blank propellant cartridge, or more modern "bullet trap" and "shoot through" types which allow the grenade to be fired using live rounds. These generally resemble a large machine-gun intended to rapidly launch grenades to suppress enemy activity in a target area. Heavier grenade launchers, such as automatic grenade launchers, are typically mounted on vehicles or in emplaced positions. The ability of the grenade launcher to loft payloads in a high arc has resulted in many "specialty" grenades such as less-lethal sponge grenades, flares, and even a video camera that surveys the battlefield from a bird's-eye view. The most common grenade-round in use by modern militaries is the 40 mm fragmentation grenade, which is effective against a wide range of targets, including infantry and lightly armored vehicles. Most grenade launchers as of 2014 are man-portable, shoulder-fired weapons issued on a squad level, though larger launchers are sometimes mounted on armored vehicles.
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