Wolverine Airsoft's BOLT HPA system converts the classic spring sniper rifle's bolt assembly over to an HPA powered bolt. The great thing about this kit is that it comes with a cylinder for the convenience of the players, so there will be no need to purchase the cylinder separately. This electro pneumatic assembly has no need for an FCU. The pulling the rifle's trigger activates the mounted trigger box powered by a standard HPA style 7.4v Lipo battery that cycles the solenoid. By removing the FCU from the system, battery performance/longevity is drastically increased. Constructed from CNC aluminum, this bolt is incredibly durable and can hangle input pressures from 80-180 PSI. It's patented Air Saver technology reduces up to 50% air consumption while firing as well. The BOLT system is also compatible with Wolverine's WRAITH system. The output energy ranges from 1 to 4+ joules which makes this system effective for virtually all FPS limits and BB weights.