Holosun Technologies HS10C Open Reflex Circle Dot Sight and HM3X Magnifier Combo Pack 510C HM3X 510C Fit 1913 Picatinny Rail Manufacturer Holosun Technologies Manufacturer part# 510C HM3X MOA 2 MOA Model 510C Model HM3X Objective 22mm Power 3X Reticle Multi Dot Type Red Dot