Please click to leave your email address to be notified when they are back in stock. Sorry I don't ship the magazine +3 Adapter to customer with a billing or shipping address in states or jurisdictions that have magazine capacity laws.  

Mec-Gar Sig Sauer P228 plus 3 adapter and the special L shaped magazine locking plate/magazine inserted needed to use them. These are to be used with the Mec-Gar Sig Sauer P228/P229 15 round magazines.



Replacement floorplate to increase the capacity on Mec-Gar Sig P228 9mm 15rd flush fitting magazines only

  1. Polymer "Plus-3" magazine extender
  2. Phosphate steel locking plate, heat-treated

Fits on the following Mec-Gar magazines:

  • MGP22815 B/N - Sig P228 9mm 15rd


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  • Model: F42140-SET (SIG P228 +3 ADAPTER)
  • Manufactured by: MEC-GAR

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