I readily admit that there are rifles out that that will need Small Base dies. But until the JRLSH tries out the die he has, we will not know if his AR is one of them. If his isn't, then there is no point in buying a small base die unless he wants to feed his ammo into a rifle that DOES need a small base die.
I am of the opinion that factory dimensions are the best dimensions for function in gas guns. A lot of money was spent analyzing the “best” tolerances and clearances for maximum function reliability. So why go larger? Why is larger better than factory?