The SIG SAUER RECOIL CALIBRATION PAK by WOLFF includes extra power recoil springs for P-226 models in 15 lb., 16 lb., 18 lb., and 20 lb. options.
Each pack comes with three extra power firing pin springs to enhance performance.
The factory standard recoil spring for the P226 9mm is 15 lb., while the .357 Sig and .40 S&W models are 20 lb., allowing for customization based on the factory settings.