SECOND LIFE - WRAITH for MTWStocks: Compatible with most M4 style airsoft guns, Wraith CO2 Stock is a complete buffer tube replacement. HPA Engines: Compatible with Inferno Gen1 and Gen2 and most other HPA engines*. For best results, use Wraith with Wolverine Airsoft products. *If you are using products from other manufacturers, check to make sure that CO2 use will not void your warranty with them. Technical Highlights Approx. 200 shots per cartridge with stock M4 setup