SP-4001C Gen3 0 MOA at 30mm height = 1.181102"
SP-4002C Gen3 0 MOA at 38mm height = 1.496063"
That means the old SP-4006 at 1.35" is between these newer models after the Colt buyout. Notice the placement of the two accessory screw locations (see pics below) mainly for the Send It Level. The 4001C you might be able to angle (90 deg) the level up (depending on the scope body size) where as the 4002C you would have to angle (90 deg) the level down AND add the A-0001 4mm Spacer to get away from the body of the scope. I had to add the 4mm spacer with the Send It Level pointing down on my SP-4006 with a Premier Heritage 5x25.