Wolff Gunsprings Website.
Hello, go to the wolff site at:
http://www.gunsprings.com under Smith & Wesson Auto pistols, then M&P.
It shows the Factory spring at 16lbs. and have the following offerings:
SMITH & WESSON M&P Series, 9mm, .40 S&W and .357 Sig
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.
Reduced Power.......: 12, 14 and 15 Lb.
Factory Std.............: 16 Lb.
Extra Power.............: 17, 19, 20, 22 and 24 Lb.
Above recoil springs.....Stock No. 532xx.....$ 7.89 ea
Please Note: Replace the "xx" in the stock number with the pound rating of spring.
M&P Recoil Spring Guide Rods
Wolff recoil spring guide rods for M&P series 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.
Stock No. 53300 - Guide rod only.....$ 24.95 ea
Stock No. 533xx - Guide rod with recoil spring.....$ 29.95 ea
Please Note: Replace the "xx" in the stock number with the pound rating of spring.