Holosun Technologies 508T-GR-X2, Green Dot, 32 MOA Ring & 2 MOA Dot, Black Color, Side Battery, Solar Failsafe, Mount Not Included HE508T-GR X2 The HE508T-RD is an open reflex optical sight designed for pistol applications. Features include a Titanium housing, Holosun's Super LED with up to 50k hours battery life, Multi-Reticle System, Solar Failsafe, and Shake Awake.