Could someone measure for me, as my weapon is on pre-order and I'm trying to place an order for my free-floater, the distance between from where the upper mates to the lower to the top of the rail? I am concerned as to whether or not this is the same lower rail that DMPS is now using or if it is the standard elevation that they had a couple years ago, which also matched the elevation of the other 308 ARs. Curious as to if it is a 2" or a 2-1/16" measurement. Is this high profile or low profile?