"The KAC Chain SAW is a prototype Light-Machine Gun system produced by the Knight’s Armament Company. The Chain SAW has been designed around ergonomic innovations to better suit the design to being fired from the hip."
Ironman prototype. Medium and heavy machine gun backpack allows single soldier to operate gun (instead of the 2 to 3 man crew it normally requires). One long, continuous belt feeding uninterruptedly from the pack into his gun.