Wraith gives you the great performance of HPA without the line Enables you to run your HPA engine with 12 gram CO2 cartridges Cartridges are completely concealed into the stock Compatible with most M4 style airsoft rifles Wraith CO2 Stock is a complete buffer tube replacement Fire approximately 200 shots per 12g CO2 Cartridge at normal PSI limits Proprietary Quick-Change end cap allows you to swap cartridges seamlessly Integrated custom Storm regulator Compatible with all Wolverine Airsoft HPA engines Adjustable pressure range of 40-140 psi No need to carry around a tank or have a line coming out of their rifleSpecifications: Brand Wolverine Airsoft Build Metal Alloy Compatibility 12g CO2 Cartridges Pressure Range 40 - 140 PSI Fitment Most M4 Series Airsoft Rifles Color' BLACK/WHITE 1X Wraith CO2 Stock