FAB Defense Smith & Wesson M&P 9 SHIELD Polymer Grip Magazine Extension + 4 Rounds “MPS-12”

3.77 out of 5
(13 customer reviews)


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About the FAB Defense M&P 9 SHIELD Polymer Grip Magazine Extension + 4 Rounds:

Maximize your Glock 43’s effectiveness with the FAB Defense M&P 9 SHIELD Grip Magazine Extension +4.  The FAB Defense M&P 9 SHIELD Polymer Grip Magazine Extension adds 4 more rounds to your Smith and Wesson magazine in a way that maintains its low profile.  The special ergonomic design enables secure manipulation of the magazine and a full grip on the weapon when the magazine is in use, making the FAB Defense SHIELD Grip Magazine +4 Extension Grip a must-have for those situations that conceal-and-carries like the S&W Shield were made for. Please see customers feedback below before purchasing this product to make sure it suits your needs and fits your weapon.

The MPS-12 will NOT fit the S&W Shield with an integrated laser. IT Will NOT fit Plus or EZ models!

Attention: Some customers have reported that the MPS12 will only hold 3 rounds instead of 4. Do not buy this product if you must have an extra 4 rounds. 

We have received feedback from customers stating that if you sand the upper base of the MPS-12 by 1mm it will fit.

Customers also noted the following "It does work with MP9 Shield 2.0 but ONLY works on the 8 round magazine, it will NOT work with the 7" 

Download PDF Manual for FAB MPS-12

A great upgrade for your Smith & Wesson Shield:  DPM Recoil Reduction



  • Adds 4 rounds for a total of 10 rounds in the magazine!
  • Enables a full grip on the handgun
  • Contoured finger indents for a firm grip during magazine manipulation
  • Innovative spring plate allows the use of the original magazine spring
  • Fiberglass reinforced polymer construction
  • Available in Matt Black with additional colors to follow


  • Smith & Wesson M&P 9 SHIELD

About FAB Defense:

FAB Defense LOGO

FAB Defense® has been leading in the development and manufacture of the highest quality, cutting-edge tactical equipment, and weapon accessories for the State of Israel’s Military and Police. FAB Defense® R&D department works in collaboration with Special Forces and SWAT teams worldwide to design creative, ability-enhancing, no-nonsense solutions to the ongoing dynamic challenges met in the field.

Smith and Wesson Shield 9mm
38 g
22 mm
45 mm
45 mm

Additional information

Weight 38 g
Dimensions 45 × 22 × 45 mm

Country of Manufacture





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13 reviews for FAB Defense Smith & Wesson M&P 9 SHIELD Polymer Grip Magazine Extension + 4 Rounds “MPS-12”

  1. 5 out of 5

    Mark H. (verified owner)

    Love it. Went together easily despite the iffy illustration assembly instructions. More importantly, even though I have only run 72 rounds through it ,the function was flawless. Grip feels good and still easy to conceal. Will run more rounds through before it becomes my carry spare even though I don’t expect there will be any issues. Well built as well.

    • Zahal (store manager)

      Thanks for the feedback. Happy you like it

  2. 5 out of 5

    Caine Morgan

    Awsome !

  3. 5 out of 5

    Caine Morgan

    Awsome ! Works great. Instructions online were to a Glock and the extensions different but if you know how to take a clip apart it isn’t too hard. Functions well shot over 100+ rounds threw it and no jams or anything ! Highly recommended if you want to add some extra bullets to your magazine.

  4. 5 out of 5


    Just received mine was a little late but said would give something extra for waiting good customer service will review what they send on line the magazine extension works great would recommend this company to anyone thanks !!! Very happy!!!Rob

  5. 5 out of 5

    Mike (verified owner)

    This +4 extension fits perfectly and is super easy to assemble and isn’t too big. I highly recommend! 5/5

  6. 3 out of 5

    Alan Caron (verified owner)

    I just installed MPS 12 and am only able to fit in 10 rounds. I will continue to try this for a while and see if it starts to work to a full 12 around capacity. On the original configuration of the magazine I was only able to fit in seven of the eight rounds they shouldn’t have. I will check to see if there’s a malfunction somewhere inside.
    Any suggestion that would be appreciated.

  7. 2 out of 5

    Bobby (verified owner)

    Does it not fit the shield 2.0?? Fits on the clip but loose when i slide it in the gun just falls right out

  8. 4 out of 5

    Byron Blair (verified owner)

    This video did not help with installing on my MP shield.. Glock in Smith and Weston is two different gun all videos it’s just coming up for Glock

  9. 5 out of 5

    Daniel Maschi (verified owner)

    Great quality, It does work with MP9 Shield 2.0 but ONLY works on the 8 round magazine, it will NOT work with the 7 round magazine.

  10. 3 out of 5

    Shawn (verified owner)

    Not bad well built , only could fit 10 rounds tho. Can I explain the proper way to install it?

  11. 3 out of 5

    Daniel Garrett

    Good but I’m only getting 10rnds as well tried 4different mags.

  12. 2 out of 5

    Greg (verified owner)

    I have the same issue only 10 fit.

  13. 2 out of 5

    Monte (verified owner)

    Doesnt fit the Shield Pro because the magazine is double stacked.

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