- BSA Generic Piston Seal.

- Fits: Supersport (all models)

- Lightning (all models)

- RB2, Goldstar & Superstar

Warning - replacing your air rifles mainspring may increase its power making it illegal. Redbeck Shooting Supplies would recommend that you seek manufacturers advice or a professional gunsmith before attempting to alter your rifle, and that you always check your rifles power using an accurate chronograph to ensure you stay within the law.