Recoil springs are available with load-rated specifications to tailor the recoil function to individual needs. Each load-rated recoil spring includes an extra power striker spring.
Note: recoil springs must be used with a solid, non-captive guide rod such as the Wolff guide rod listed below. Spring will not be captive.

Factory Ratings:  9mm - 16 Lb
                            .40 S&W - 17 Lb.

• Reduced Power.................: 12, 14 & 15 Lb.
• Factory Standard 9mm.......: 16 Lb.
• Factory Standard. .40 cal...: 17 Lb.
• Extra Power......................: 19, 20, 22 & 24 Lb.

Wolff recoil spring guide rods for Sigma pistols are the ideal companion for Wolff recoil springs above. Guide rods are solid steel, hardened to a minimum of 55-RC and now have a jet black finish that won't wear off and provides corrosion protection. Wolff guide rods provide optimum performance for Wolff recoil springs through better support and spring alignment. Permits you to keep factory recoil assembly intact. Available as guide rod alone, or with your choice of recoil spring. Please see spring rating information above.

W. C. Wolff Company offers reduced power striker springs (firing pin springs) for Sigma pistols rated at 3.5 pounds. The factory spring is 4.75 pounds. This spring will help reduce trigger pull. 
For use in all Sigma series pistols except .380.
Warning: For competition use only - not for duty use.