The 1.5 inch Drop is for the Armegeddon Air System and the 2 inch Drop is made for everything else.
Blue color is darker than most other blue products out there.
Others will ask about it. It turns a lot of heads at the fields and gets me known. I also use it with a CP barrel on my cocker. The blue colours are identical, not close. Great looks, puts the tank perfect position and if you get there ASA it is adjustable, you can slide it forward or backwards.