The one in the review is this one listed at Redwolf. The CAS version is similar, but without some of the extras like BBs, barrel wrench and generally cheaped down wherever possible. Even the box is different with different graphics.
G&G has the most solid and visually appeasing fiberglass/nylon parts in the air soft industry, making you study the composite hard to realize it is not actually metal. These guns come stock with metal bearing bushings and a customized black gearbox for the Canadian market .
I have seen many G&G over the years. The CAS one did not impress me at all, not even in comparison to a cheap Chinese Marui-clone.