That's awesome. But, aside from the tail, there are also some subtle design differences between the Marines and MGS 4 versions of RAY. If I can recall correctly, I think the knees in the Marines RAY are more pointed at the top.
All i know about the different on Rays and Marine Ray are the tail and the knee armor, the Marine Ray has pointed knee armor and the other Rays all have round knee armor. The head of Mass production Rays in MGS2 have a bit different on cheek and they are all Cyclops.
Marine Ray is my favorite model among all Rays, but did there still have any other different parts of Marine Ray? (other than body paint, tail and knee armors)