This kit contains most things needed to service Weihrauch HW99 spring guns.

The kit includes:

- Weihrauch Mainspring

- Weihrauch Piston Seal

- Weihrauch Breach Seal

- Bisley Spring Grease

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.