Umarex Zelos PCP Air Rifle Precharged pneumatic Sidelever action 1/2" x 20 threaded muzzle with cap 250cc air cylinder Max. fill pressure: 3,625 PSI (250 BAR) Receiver-housed adjustable regulator Max. velocity (w/12gr pellet): 1100 FPS (.22), 1000 FPS (.25) Max. power: 26 FPE (.22), 36 FPE (.25) Shots per fill: 75 with 11.9gr (.22), 70 with 25.39gr (.25) Regulator set at 1000 PSI Magazine capacity: 20 rounds (.22), 18 rounds (.25) 21-slot Picatinny optics rail 8-slot Picatinny accessory rail under forearm Ergonomic textured pistol grip Ridged rubber buttpad Barrel length: 26" Overall length: 36" Includes 2 magazines Please Note: The manual may give instructions on how to adjust the hammer spring. Umarex has since removed this functionality and the hammer spring is no longer adjustable in newer guns.