specification POWER SOURCE Ordinary Spring /Gas Spring FIRE MODE Manual& Single Shot AIR CAPABILITY 4-8.5lbf SAFETY AUTO@ DOUBLE SAFETY SAFETY FORCE OM 1-6lbf/OFF 1-6lbf CALIBE 4.5MM/5.5MM VELOCITY 4.5:1250FPS /5.5:900FPS COCKING FORCE <35lbf LIFE Over 5000 times .