My gamo break barrel is only shooting 450 fps, so i took apart my first break barrel, thinking I'd find a scored up piston seal but it is smooth but seems very hard plastic, normal ? I don't know . Years ago we softened r/c car part by boiling them in water, has anybody had success doing this. Looked online for replacements and average cost is over 20 $ w/shipping, is there also a way of knowing spring is weak.