AceTech Quark R Tracer UnitQuark R ACETECH, the market leading tracer manufacturer creates a modular tracer unit, Quark R, Quark M, patterned after the Quark K tracer, features muzzle flash beam, twelve 3535 UV LED, G motion sensor that triggers tactical light and RGB rainbow beam for KSG. Quark R is designed specifically for the Tokyo Marui M870 shotgun, M870 Breacher, A&K M870, Golden Eagle M870 and most of the airsoft shotgun models. The Quark M supports glow in the dark