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Wolff Extra Power Recoil Spring for S&W Pistols - 17 LB | 645/4506 .45 ACP | Part 47317 SW-New-Revolver Smith & Wesson K FrameWolff Extra Power Recoil Spring for S&W . 45 ACP Pistols Part Number: 47317 Premium Wolff 17 LB extra power recoil spring designed for Smith & Wesson . 45 ACP pistols. This precision engineered spring provides increased spring tension for reliable cycling with hot +P ammunition and compensated pistols. Includes extra power firing pin spring to ensure reliable primer strikes. Compatible Models: This recoil spring fits the following Smith & Wesson . 45