It now comes in 6mm version. A tiny little 5-shell revolver that features actual shells; the X-Cartridge system makes use of a gas reservoir inside the weapon as per normal but BBs are loaded into imitation shells which are loaded into the revolver just like the real thing. In this instance, the weapon and shells are of the 6mm variety.
Despite its low power, as an 6mm weapon its power ensures that if you are hit you are definitley going to feel it. It will only be effective over short range but it will still hit human sized targets quite easily and for this price its one of the cheapest shell loading weapons around.