Never even had air to it. Comes with the extra shells and speed loader that is pictured as well.
Here is what Evike.com has to say: FPS Range:
400-500 WG CO2 Full Metal 6" High Power Airsoft 6mm Magnum Gas Revolver (Black)
The WG Revolver series are apart from most traditional Airsoft revolvers when it comes to constructions, durability and performance. The entire frame and the bull barrel on this revolver is constructed of metal, detailed design and finished to perfection. The full metal constructed wheel flips out to the left for shell loading simulating maximum realism on an Airsoft revolver. The power source (12g) CO2 is hidden inside the ergonomic pistol grip. Features:

Realistic Single / double action

Six round capacity

Rail mount for optics

Dimensions:
280mm x 150mm Muzzle Velocity:
~450 FPS (measured with .20g BBs and CO2) Magazine:
6 rounds, compatible with WinGun or Dan Wesson cartridges Gas Type: 
CO2 Firing Mode:
Semi Automatic, Safety System:
CO2, non-blowback Hopup:
No Package Includes:
Gun, Cartridges, Speed loader, Tactical rail, and Manual Manufacturer:

Win Gun