Part# 27131 Wolff Precision Gun Springs delivers enhanced extraction performance for select Smith & Wesson 9mm pistols. This XP Extractor Spring provides 18 pounds of tension—exceeding the factory 17-pound specification—ensuring more positive extraction in models 469, 669, 6904, 6906, 6924, 6926, 6944, 6946, 3913, and 3914. Precision-engineered for consistent reliability and improved functioning in these specific S&W firearms. Supplied as a single unit.