|The Sun Project M203 Grenade launcher is a realistic tactical addition to your AEG. Not only does it look realistic, but it is completely functional when paired with the Mosquito Molds BB shower shell which is powered by green gas. This reusuable shell stay safely in the tube and sprays your target with 165 bbs. The M203 will fit on the following Tokyo Marui models: M4A1, M4 RIS, SR16, M16-A1, M16-A2, and the M16 Vietnam Version. Weighs 4 pounds.