Benelli M4 Magazine Extension

(131 customer reviews)


Shipping to USA, Canada

Frequently Bought With:
This item: Benelli M4 Magazine Extension
Benelli M4 Magazine Cap Titanium

Benelli M4 Magazine Extension

Rx Arms Solutions Benelli M4 Magazine Extension tube increases the Benelli M4 Magazine Capacity +2 for USA Residents. For Canadian Residents; these tubes are NOT plugged for Canadian legal capacity, and need to be plugged prior to installation to comply with Canadian Law.

CNC Precision machined from solid 4140 Hardened Steel, boasting a yield strength of 130,000 psi, double that of mild cold rolled steel. Ships to USA and Canada. The Rx Arms Benelli M4 Magazine Extension is for those M4 owners who do not wish to perform the tasks needed to swap out their OEM Benelli M4 Magazine full tube, but still desire to increase to full capacity.  No replacement mag spring is needed, OEM spring can be used.  Additionally, users can gain another 0.15″ of spring space if you use the Rx Arms Benelli M4 Magazine Cap Titanium.

It is a simple process to expand your capacity with this extension, and requires no gunsmithing whatsoever.  See Benelli M4 Magazine Extension Installation video below. The Rx Arms Benelli M4 magazine extension is of the highest quality and best mag extension you can find.

Benelli M4/M1014 & Benelli M4 H2O Magazine Extension Colours

We offer two Cerakote colours:

  • Custom Dark Charcoal Cerakote for Benelli M4 Black Shotguns, to closely match dark grey parkerized M4/M1014 OEM magazine tube.
  • Titanium Cerakote for Benelli M4 H2O Titanium Cerakote Shotguns.

Note: For Black Benelli M4 shotguns, parkerized finishes can vary from batch to batch, the Dark Charcoal colour may not be a perfect match to all Benelli M4 shotguns due to the variances in parkerizing.  Also note, Dark Charcoal is NOT black in colour, it is dark charcoal grey to match the Benelli M4 mag tube.

For clones, be aware dark charcoal is NOT black, and will look dark grey next to any black barrel or black mag tube.

Benelli M4 Clone Compatibility

Below is a list of clones and compatibility with the Rx Arms Magazine Extension.  We do not guarantee the information below as it is taken from end user customer reports only.

  • Panzer M4 – NO **
  • SDS S4 – NO
  • MAC 1014 – YES
  • Black Aces S4 Pro – YES
  • SDS Tac12 – YES
  • Aska M4 – YES
  • Sulun Tac12 – YES

**For the Panzer M4, some customers have been successful using a 1 1/8″ bicycle stem/head set spacer kit, or you can try a 1″ stem/head spacer kit. Make sure the ID of the spacers exceeds 1.01″ to fit over the tube, and the OD of the spacer should ideally be 1.24-1.29″, you may need 20-30mm of spacer width.

Benelli M4 Magazine Extension Specs:

  • Rx Arms Benelli M4 Magazine Extension is specifically designed and tested for the Benelli M4/M1014.
  • Direct replacement for Benelli 81043 (for USA residents)
  • Rx Arms Benelli M4 Magazine Extension will replace the factory neutered plug from Benelli, and increase capacity for +2 for USA residents, Canadian/USA residents need to plug the tube themselves to comply with Canadian/USA state firearm laws if required.
  • Material: Rx Arms Benelli M4 Magazine Extension is made from 4140 hardened steel.
  • Weight: 102g
  • Rx Arms Benelli M4 Magazine Extension is Custom Cerakote Dark Charcoal for black shotguns or Titanium Cerakote for H2O shotguns.
  • Lifetime warranty like our other parts and accessories.
  • Made in Canada.
  • Ships to USA and Canada.
  • Refund and Returns policy can be viewed here.

Benelli M4 Magazine Extension Installation:


Canadian/USA Residents Legal Compliance:

  • These tubes are NOT plugged for Canadian Legal Capacity.  It is the gun owners responsibility in Canada/USA, to ensure that their magazine capacity is compliant with Canadian/USA State law, in addition to USA 922 (r) compliance.  Rx Arms Solutions takes no responsibility to plug this tube to legal capacity of 5 x 3″ shell in Canada, or capacity limits in individual states in the USA.

USA Residents Customs Info:

We have been shipping our products to USA customers for years without issue, below are some items to note:

  • USA customer are responsible for any customs tax/duties, however anything under $800 USD is rarely taxed according to the research I have conducted. This is not legal advice, do your own due diligence.
  • According to the ATF, a Form 6 exemption is granted for sporting shotgun parts/accessories as stated on point 6. “Sporting shotgun parts other than firearm frames or receivers or barrels.” [are exempt from Form 6].   The Benelli M4 is a shotgun that is legally imported into the USA as “generally recognized as particularly suitable for or readily adaptable to sporting purposes.” (further details on this can be read in the ATF National Firearms Act Handbook).  As such, it is a sporting shotgun when it is imported into the USA, and according to the Form 6 exemption list, does not need a form 6 when importing parts and accessories..  This is not legal advice, please do your own research and due diligence.
  • USA Customs Label “Sporting Shotgun Accessories” (HST Code 9305.20.80 Found in Chapter 93)
  • USA Shipping: This item will be shipped with tracking.

Other International Shipments (IMPORTANT):

    • Other International customers are responsible for any customs tax/duties.  This is not legal advice, do your own research and due diligence.
    • International customers are solely responsible to comply with all of their local laws and regulations.  Rx Arms Solutions is not liable for any legal compliance issues that may arise from the purchase of my products.
    • For Customs, this part will be labeled as “Shotgun Accessories”: HST Code 9305.20.00
    • International Shipping: Items will be shipped with tracking.
    • Once shipped, this item is non refundable, if it gets lost in the mail, it is the customers responsibility and cost.  Rx Arms Solutions is not liable for any lost shipments.

Backorder/Preorder Terms:

    • Backorders are payment in full.  If, for whatever reason, you need to cancel the backorder before it ships, I will need to take 5% off the total backorder amount to refund the amount.  This will cover charges my credit card processor charges me.  For example, if the order was for $100, I will keep $5 and return $95 to you, to cover my back end costs.
    • When ordering a backorder item with an item in stock, the shipment will be delayed until all items are in stock.

Feel free to check out my other Benelli M4 Parts and Accessories which you may enjoy.  Get more information on the Benelli M4 Shotgun. The Benelli M4 is a versatile shotgun that is great to carry when hiking, hunting, or getting outdoors in the woods. 

131 reviews for Benelli M4 Magazine Extension

  1. Doug Yates (verified owner)

    Great metallurgy and fit to the M4. Easy installation and color match to the original finish. Functions perfectly with original spring!

    Image #1 from Doug Yates
    Image #2 from Doug Yates
  2. Jay A. (verified owner)

    Perfect fit, works well! Took me all of 10 minutes to remove the magazine spring retainer, swap the dummy extension for the RX Arms extension and reassemble the whole thing. A good value and beats having to heat the receiver to replace the original magazine tube.

  3. Lucas (verified owner)

    finish and fitment is perfect 👌

  4. Devon Rounsaville (verified owner)

    The color doesn’t match, but I don’t really care as long as it works, and it does. It was easy to swap out the parts. I’m really happy with it and I highly recommend it.

    • Robb Hutzal (store manager)

      Thanks for the review Devon. IF you are using the Dark Charcoal on a clone, it will not be a good match as the clones have a black tube and barrel. As for the M4, the dark grey parkerizing of the OEM tube can vary from batch to batch, but our custom paint is typically a very good match. If you have any issues, please do contact us!

  5. Charles (verified owner)

    The magazine tube extender was an excellent and easy solution to bringing my Benelli m4 up to full capacity. Installation was easy and the video tutorial was informational and to the point. I would certainly recommend this company and product.

  6. Jesse (verified owner)

    Is the tits!

  7. Byran Houghton (verified owner)

    This is absolutely a great place to do business!!

  8. James (verified owner)

    Perfect color match, very easy install.

  9. Devon (verified owner)

    MAC 1014 this works awesome but color don’t much no big deal though

  10. Frank Kolba (verified owner)

    Very nice. Much cheaper and easier than replacing the whole tube for the same result.

  11. Anonymous (verified owner)

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