Wolff Hammer Spring for Sig Sauer P220, P225, P226, P228, P229 Models with Polymer Hammer Spring for Base Retainer 18 lb Reduced Power

Factory replacement parts are manufactured to the exact same specifications and tolerances and use the same manufacturing materials as the original parts. Some parts may require installation by a qualified gunsmith.NoteRecently Sig has started using a plastic hammer spring base/retainer with a short hammer. spring. This is being phased in across all models. If your pistol has the plastic base/retainer for the hammer spring, the reduced power 17, 18, 19, and the standard 20 lb. are for your pistol.