SigmaTrigger Reduced Power Spring for SW40F, SW9F, SW40C, SW9C, SW40V, SW9V, SW40E, SW9E, SW40VE, SW40Ti, SW357V, SW9VE, SW9P, SW9G, SW380M, SW9MSIg Does not Fit anything made after 2012 Authentic SigmaTrigger Spring Kit Reduced pull weight to 5.5 - 7 lb Easy to install Drop in replacement same size as OEM for a perfect fit 100% reliable! Easy No-Hassle Guarantee!