The 2016 GMC Sierra 1500 All-Terrain X 1 / 10 Next The front end of the 2016 GMC Sierra 1500 All-Terrain X The front end of the 2016 GMC Sierra 1500 All-Terrain X in Onyx Black. 1 / 10 Next The 2016 GMC Sierra 1500 All-Terrain X in Onyx Black Your name Subject Comment *