Floyd's Custom Shop

FCS S&W M&P 6-Round Mag Extension


This Smith & Wesson extension adds 6 rounds to your magazine. Easy assembly. Made to match our S&W magwell. Works on All double stack M&P Mags 9mm and 40. If you do have a .40 it will only be a +5 extension. Some 9mm mags will only fit +5 until they wear in. The 6th will be very tight. 

Stock Spring is all you need.  

Black hard anodized aluminum. Color anodize will vary with each batch 

*CAUTION* Our bases and extensions WILL have problems when dropped repeatedly on concrete. They are Hard Anodized, but they are still aluminum parts that will take on damage. When installing the extensions, only tighten the back plates down until secure. The plate may crack or break if tightened down too much.

  • Fits IDPA Box
  • Only compatible with Floyd's Custom Shop Magazine Wells or no magwell
  • Black Anodized Aluminum


Online Orders will ship out between 1-3 business days. Parcels are shipped via Canada Post and only to Canadian addresses. All parcels will have tracking info and will require a signature upon delivery.

For those residing in Remote Locations (Air Only Destinations) please select "Air-Only" shipping option and we will contact you directly with a shipping quotation.

30 Day Refund or Exchanges

Should the items you purchased not meet your expectations, you may return or exchange them within 30 days of the original date of purchase. This can be done by shipping the item back or by bringing the item to our shop (by appointment only).

Items can only be returned if they meet the following criteria:

  • New and Unused
  • Original packaging intact

This policy excludes certain items. Items such as:

  • Firearms of any kind

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