TUNED THEY WILL GIVE U 700 PLUS LIKE MINE AND THE ONE I SOLD .U COULD USE CO2 OR BUY THE PLUG FROM ARCHER AIRGUNS TO USE PAINTBALL BOTTLES .CO2 GIVES U 30 TO 40 SHOTS U COULD TELL WHEN YOU R NEEDING TO CHANGE THE CO2 A GOOD 33 SHOTS IS GOOD ENOUGH AFTER THAT U R WASTING PELLETS .THESE RIFLES R GREAT IN THE SPRING AND SUMMER.THESE RIFLES R VERY ACCURATE AND POWERFUL ENOUGH TO TAKE OUT SMALL GAME OR JUST TO PLINK OR TARGET PRACTICE.I LIKE THESE RIFLES IF YOU R PLAINING ON BUYING ONE IT WILL BE A GREAT CHOICE AND AFFORDABLE ALSO.ANYMORE QUESTION YOU COULD PM ME ...JORGE