Amazon.com: HOLOSUN HE510C-GR Multi-Reticle Green 2 MOA Dot,Holosun HS510C 1x0.91-1.2in Open Reflex Red Dot Sight for,Amazon.com: HOLOSUN HE510C-GR Multi-Reticle Green 2 MOA Dot,HS510C-Holosun,Just bought Holosun 510C. Whats all this red shit? : r/ar15