Sig Sauer P220 – 29 Hammer Spring 17lb. $9.97 17lb. Reduced power hammer spring. Improves trigger pull. Factory standard is 24lb for reference. 28317 For Use in: P-225, P-226, P-228 & P-229 P-220 with serial number above 219166 Out of stock Categories: Sig Sauer, Wolff Gun Springs Related products Enfield 1914 / 1917 Rifle Service Pak $24.97