What an awesome sight. I sweated over my next sight choice but I def. made the right choice here. With the Holosun 1/3rd riser it is perfect. I wasn't sure about green reticles before but I'm a believer now. I also am believer in the 65 MOA ring/dot reticle. Loved it on the EoTech XPS2 and love it here too. A 2 MOA dot seems so slow to find once you get used to the 65 MOA ring. Plus the reticle is configurable so you can have either one anyway. If you're on the fence about the 510C just get it!