Replacement hammer spring (also sometimes called main spring) for the FX Maverick air rifle

For FAC / high power: Select part 11500 – Same spring for all calibers including FAC (.177; 4.5mm, .22; 5.5mm, .25; 6.35mm, .30; 7.62mm). This is the lower (shorter) spring in the picture, however is the stronger of the 2

For UK limit Sub 12ftlb (all calibers): Softer but longer spring (16024).

If you change the spring in your rifle to a different version than supplied originally the power may change and the regulator pressure may need adjusting to attain the correct power levels.