If you want cheap POWER the stealth has to be the daddy in the USA .Not in the uk they are expensive and with only 12 ftlbs allowed you need consistent shots and for the money spent on stealth they are rubbish . ......Does you valve move ...... if you are keeping the stealth you want to learn how to fix it your self, that has to be the only good thing about a stealth the ease you can take it a part.