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Third Arm Weapon Interface System

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The Third Arm Weapon Interface System (TAWIS), or Third Arm, is a passive, stabilizing device developed by the US Army Research Laboratory (ARL) in 2016 to redistribute the weight of heavy firearms to make them easier to hold and carry. It weighs less than 1.8 kg (4 pounds) and consists of a mechanical appendage made out of carbon fiber composite that has one end attached to a carbon fiber plate that fits inside an armor plate pocket and the other end attached to a Picatinny rail on top of the gun. It was designed to permit more accurate use of heavier weapons and reduce fatigue by displacing the weight of the weapon from the arms to the torso and to mitigate weapon recoil. As of 2018, the Third Arm is a prototype that is still in the testing phase of its development.