I now have two Grizzly's. This is the official combat engineer vehicle. They opted for more protection, so this one is heavier. They also have more equipment and a bigger computer array. There are some minor cosmetic differences too. It has a shortie machine laser instead of a full-sized one. The gunner a lot better protection. There is more storage space bihind the cockpit. The thing in between the windows is an infrared/thermal imager.