Not as far as I know and I`ve used a few. Fine for target shooting but ridiculously overpowered for skirmishing. I got hit on the forehead by a bb fired from a co2 pistol at a local site, from a fair old distance. It drew blood and left a sizeable bruise, had a headache for about 24 hours. 
They can be run at a lower velocity by fitting a low pressure regulator, like on a paintball marker. Unfortunately, with it being a pistol, you'd have to run the regulator "in line" as there isn't room in the gun for it. Basically, the gas source goes to the reg' and then to the gun. So, this means you'd have to have a remote setup, with a line from the reg' to the gun. It's a lot of hassle and not worth the cost for airsofting.
When I want your opinion - I'll tell you what it is!