I don't like the rings that mount right to the receiver. If you need to remove the scope from the rifle, everything needs to be taken apart. I prefer the picatinny rail, it's basically a weaver base that has extra slots to give you more mounting options.

I have the same scope in the 3-12x40mm option on my Daniel Defense AR-15 and I love it, and the adjustable turrets are great. I sight in my rifle with my deer hunting load, then remove the screw and adjust the turrets to zero. I take my rifle to the range at least once a week and I can adjust the scope for my target loads. Then when I go hunting, all I need to do is adjust the scope so the zeros lines up and it's sighted back in for the hunting loads.