The Wolverine BOLT is an HPA conversion kit for Bolt Action sniper rifles. It helps you to STAY HIDDEN, STAY ON TARGET, and SAVE AIR. Because it is intrinsically quiet, you can be the ultimate stealthy sniper. Because there is no spring, you can seamlessly cycle the action while staying locked on your target. With our new Air Saver technology, you get the most out of your HPA tank or CO2 cartridge. Since it is electro-mechanical, it requires no FCU!