A popular conversion kit for those who own the airsoft M249s and LMGs, the Mugen Fire Custom ChainSAW Zombie Killer Kits are all available at eHobby Asia... "The ChainSAW, 'SAW' stands for "Squad Automatic Weapon", was originally developed as a technical concept to test new ergonomic designs for light machine guns. The Chain SAW was designed to only be fired from the hip, with a handle along the top to hold the firearm."