Ken Lin shows an optic for airsoft use that is based on the Vortex AMG UH-1 that is available at Spec Precision... "Uh1 and UH2 are different in appearance, The main difference is that uh1 supports USB charging, and UH2 no longer has USB, but has MOTAC(MOTAC (Motion Activated Illumination powers up when it senses motion and powers down when it does not.)"