Smith & Wesson M&P Recoil Springs - M&P 16 Lb. Factory Weight Spring

For full-size 9mm, .40 S&W and .357 SIG pistols. Factory spring is 16 lbs. Use a lighter-weight spring with light loads or to soften felt recoil for faster recovery in competition. Use a heavier-weight spring with "hot" loads or to enhance cycling reliability. NOTE: These springs require a full-length, non-captive guide rod. Each recoil spring, including those in calibration kits, comes with a factory weight striker spring. Calibration Paks let you try out different weights to see which works be