I replaced my spring and piston seal with a crosman quest spring and seal. Add a polished washer to the top hat end of the spring. Polish the spring end and the whole length of the coils with about 400 or 600 wet dry paper, get you some heavy tar and coat the spring just a little. Then shoot, shoot and shoot it. There is another spring Mike gave me that calmed the gun down some but at high altitude I need as much force from the spring that I can stand.