The Holosun 510C is a lightweight, waterproof full-sized red dot. The lens is nice and clear. It has a 2MOA dot which is excellent for the more precise 100 and 200+ yard shots. It also has a 65MOA which is great to help with the speed one can sight in on a target. The 65MOA circle also makes the sight a good match for my shotgun as well as my Ar15s. The circle and dot can be used together or either can be used alone. Batteries last a very long time and it has a solar panel array just in case. Well-built and nearly bullet-proof this is a great sight so if you are on the fence it's time to come down from there. Just buy it.