The M-223 is an example of high quality optics. The glass on this scope is great. For my AR, it works great for 100 yards and up to 400 yards. I have not tried it longer than that but I am sure it works no problem. I highly recommend this product.
Pros: Clear Optics, easy to set up, looks good on my AR, Holds zero everytime
Cons: Can't have both eyes open as you would with a red dot.
This review was written in the old system and had content requirements that are different than reviews written today.