http://reddotshooters.com/holosun-hs503c-red-dot-sight-the-low-priced-high-value-reflex-sight-for-your-firearm-reddotshooters-com-review/
Need help determining which red dot sight to mount to your rifle? Here's a video that describes 3 reasons why the holosun hs503c is the best red dot sight for the money!