Apart from the Wraith CO2 Stock, Wolverine Airsoft also announced the BOLT Conversion Kit for Airsoft VSR Sniper Rifles... "The Wolverine Airsoft BOLT replaces the spring system in a VSR Sniper Rifle and converts it to HPA. Bolt provides a smooth action, deadly accuracy, and is extremely quiet. It requires no FCU and is also compatible with our new WRAITH: CO2 Stock system."