M&P®9 SHIELD™ +4 Magazine Extension

SKU fx-mps12b
In stock
Product Details

The MPS-12 allows modifying the original 8 round magazine of the M&P Shield into a full capacity 12 round magazine, all this without having to replace the original magazine spring.


  • + 4 rounds for a total of 12 rounds in the magazine!
  • Innovative spring plate design, allows for the use of the original magazine spring
  • Enables a full grip on the handgun
  • Contoured finger indents for a firm grip during magazine manipulation
  • Easy installation, no Gunsmith required
  • Fiberglass reinforced polymer construction


  • 8 Round, S&W M&P®9 SHIELD™ - original factory extend capacity magazine only!
  • Will not work with factory installed Crimson Trace laser
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