M203 grenade launcher, with authentic look and feel, it operates like the real thing in every way, from loading the grenades to extracting them after use. The M203 is one of the most recognizable grenade launchers, this short-barrel launcher is designed to be mounted underneath your rifle on a standard rail, with a quick detachable mount, and is capable of holding an airsoft grenade, which is a device that looks like a real world grenade, but uses a gas propellant to fire a variety of projectiles, like large amounts of 6 mm BB's. When inserted in a grenade launcher, and fired, it shoots all the BB's at once with a big blast, great for room clearing and suppressive fire.