S&W M&P Magazine Springs Extra Power +10% (XP) by Wolff
Magazine spring are available for M&P 9mm and .40/.357 magazines and are +10% extra power over factory springs. Springs are for use in the following magazines:
9mm - 17 Rounds .40/.357 - 15 Rounds
9mm - 12 Rounds (Compact) .40/.357 - 10 Rounds
9mm - 10 Rounds .40/.357 - 10 Rounds (Compact)
9mm - 10 Rounds (Compact)
