Just bought my first black rifle DPMS 308 Flat Top and have a Leupold 8.5x25x50mm I want to put on it.Im gonna use Leupold Mark 4 rings on the rail.Someone told me that I absolutley have to use high or super high rings on any AR because of the straight stock.Ive always used the lowest rings possible when scoping anything Ive owned such as hunting rifles and pistols.Does this NOT apply to the AR? Let me know your thoughts.Thanks!