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)
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)
Will also fit CZ MecGar Mags with spring to follower modification.
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