Patented Dual Solenoid Design The dual solenoid design of the F2 provides the same functionality as the legendary Fusion Engine but in a more compact, efficient and flexible design. Dual solenoids allow for the nozzle and the poppet valve to be adjusted independently of each other for unparalleled control over both the loading time and air volume used. Additionally, this makes it possible to change the firing sequence giving it the ability to operate in both true closed bolt as well as #34;AEG #34; mode. Spring Loaded Nozzle The F2 nozzle is spring biased forward which provides a consistent loading force regardless of operating pressure. It shares the same spring as the Fusion Engine with both light and heavy spring options available to adjust the loading force. Complete Tuning Control The F2 comes complete with a Fire Control Unit (FCU) that has an LCD display that allows you to tune your F2 to your liking! Adjust it #39;s dwell, rate of fire, burst modes, nozzle feeding, and more! Specifications Velocity Range: 250fps - 500fps Operating Presure: 45-145 PSI Compatibility: ALL AEG Offset and Centerline cylinders and nozzles. Wire harnesses are available in 7.5 #34;, 13 #34; and 18 #34; standard lengths Interchangeable Bushing Inserts which prevent any movement of F2 within the gearbox. Custom nozzle lengths available. Low velocity poppets ( lt; 1J) available. Light and Heavy nozzle springs available.