AceTech Quadra S Bifrost Red/Green Pistol Tracer Unit - BlackMeet the Quadra S Tracer Unit small, square, and absolutely savage on style. Built for players who like to stand out (and light up the field), the Quadra combines next gen sensor tech with a sleek, compact design that fits both pistols and rifles. Its plug and play easy just screw it on, power it up, and let the tracer rounds fly. And yes, we thought of everything it even comes with an 11mm CW to 14mm CCW adapter for pistol users, plus an adjustable