I have my first AR (Noveske 7.5" Diplomat) on order and since I am new to this type of weapon, I'd like some help in choosing ammunition that will work best in this 1 in 7" twist, 7.5" 5.56mm stainless barrel. In this short of an SBR, do any of you have any real-life experience (good or bad) that you'd be willing to share?