er, as far as i know it aint, look at the marker, u can see the inline already on it, which means u need an air system or co2 on the grip...screwed on so the bottle will come out the back....not downwards...
Cockersrule is right. On the picture of the cocker, there is a black vertical regulator (unlike the marker in your avatar which just has hose going from the ASA straight to the screw-in. The screw in is where your CO2 bottle attatches).
Anyway, the black vertical regulator will have an elbow and all you need to do is add a screw in/drop forward thingy (to the bottom of the gripframe) and connect hose between the reg and the screw in and just attatch the CO2 bottle and your away.