The tiger stripe M16 used by Chang in Modern Warfare (2010), the paintball episode of the previous season, apparently (by the feeding hopper and bore of the barrel) fires 17mm paintball pellets. However, the guns used in this episode are not, in fact, paintball guns, but gas powered airsoft guns equipped with paintball pellets. These guns require a 6mm pellet and would not be compatible with the 17mm pellets in the cache.