specification POWER SOURCE Ordinary Spring /Gas Spring TRIGGER PULL Two-Stage Adjustable Trigger,1-6lbf SAFETY Manual Safety SAFETY FORCE OM 1-5lbf/OFF 1-5lbf CALIBERl 4.5MM/5.5MM VELOCITY 4.5>900FPS /5.5>750FPS GROUPING <38.1MM FOR 10-Meter Target BREAKING FORCE 4-20LBF HAMMER TEST 30lbs*30s COCKING FORCE <50lbf LIFE Over 5000 times .