Hey whats up? Just joined recently to learn a little more about shooting, in the past I would sight in at a known distance and wouldnt shot much past that distance. My desire is to atleast get a basic knowledge of how to use a rifle/scope combo properly using MOA adjustable scope. I purchased a M&P AR15 223/Vortex Viper 1-4x24...I know its not a LOOONG distance rifle but I have confidence that it will reach to 600yds easily. All opinions and critic base responses enthusiastically accepted. THANX Calvin