Benelli M4 Magazine Extension

(35 customer reviews)


Shipping to USA, Canada

Frequently Bought With:
Benelli M4 magazine extension
Benelli M4 Magazine Cap Titanium
This item: Benelli M4 Magazine Extension US$79.00 US$79.00
Benelli M4 Magazine Cap Titanium US$98.00

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 Cerekote colours:

  • Custom Dark Charcoal Cerekote for Benelli M4 Black Shotguns, to closely match OEM magazine tube.
  • Titanium Cerekote for Benelli M4 H2O Titanium Cerekote Shotguns.

Note: For Black 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.

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.

  • Black Aces Tac S4 – YES
  • Panzer M4 – NO

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 Cerekote Dark Charcoal for black shotguns or Titanium Cerekote 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. 

35 reviews for Benelli M4 Magazine Extension

  1. Abdulla J. (verified owner)

    The finish is super close to the magazine tube. Well designed and executed.

  2. Anonymous (verified owner)

    easy to install and no gun smithing required simply remove the old one and install the new one. also such a nice feature that you don’t have to buy a new mag tube spring, and to top it all off if there’s any confusion there’s a video on the site you can reference for installation.

  3. Michael C. (verified owner)

    Easy to install. Looks and functions great.

  4. Joe (verified owner)

    I purchased one for my Blk Aces Tac S4, fits like a glove and looks awesome. Easy install, definitely recommend picking one up. Its worth the wait on shipping. I bought a bolt release tab, expecting the same level of quality.

  5. Anonymous (verified owner)

    Just a quality product !!

  6. Mike (verified owner)

  7. Richard K. (verified owner)

    Excellent, as expected.

  8. Josh N. (verified owner)

    Great extension matched perfectly functions flawlessly.

  9. Anonymous (verified owner)

  10. Brandon M. (verified owner)

    Fits perfectly, machining is perfect, colour is a little off but would recommend to a friend

  11. Othello shirley (verified owner)

  12. Anonymous (verified owner)

    Great product

  13. Jeff T. (verified owner)

    The titanium coating matches my gun perfectly. Quality item

  14. Beau Osteen (verified owner)

    Fits like a glove and looks great doing it….buy with total confidence!

  15. Larry (verified owner)

    fits well – looks great – thanks

  16. James Myshak (verified owner)

  17. Joshua Kelly (verified owner)

    Looks great, fits great, easy to install. Definitely recommend.

  18. James Myshak (verified owner)

  19. Anonymous (verified owner)

  20. Anthony Acuna (verified owner)

    Received my magazine extension tube and immediately examined it prior to installation. The quality, fit, and finish of this extension tube is truly astonishing. Attention to detail really speaks for its self. The machining is clean and accurate. Easily installed my M4 with no issues, no burrs or sharp edges. The color very Very closely matches the existing magazine tube. I truly am impressed. As a bonus, the shipping was really fast. Five stars is not enough for this level of craftsmanship and service. Thank you for an amazing product.

    Image #1 from Anthony Acuna
  21. Alex P. (verified owner)

    Good quality

  22. Axel (verified owner)

    Superb craftsmanship! Fit and finish exceeded my expectations!

  23. Anonymous (verified owner)

    Excellent fit and finish

  24. Greg R. (verified owner)

    Great parts at reasonable prices in unreasonable times. Upgraded my platform to the next level!

  25. Anonymous (verified owner)

    Great product.

  26. Anonymous (verified owner)

    quick shipping as described

  27. Tyler (verified owner)

    Colour matched up good, craftsmanship is excellent. Made in Canada. Highly recommended.

  28. Anonymous (verified owner)

  29. Anonymous (verified owner)

    Answers his phone , shipping is fast, product is perfect. Third time purchasing.

  30. Anonymous (verified owner)

    Pure and simple excellence.

  31. Bayne Balaski (verified owner)

    Great product. Well made precise fit and finish. Finishes off the M4 to look like it should. Robb continues to make superb products for the M4.

  32. Dave (verified owner)

    Perfect machining; excellent quality! The dark cerekote is a very good match and looks far better than the original!

  33. Babayaga (verified owner)

    Awesome!! Looks great; got the Dark Charcoal, and as previous reviewer has said, colour matches almost perfectly with OEM.
    Very nicely made piece, and customer support was friendly and helpful.

  34. USA Guy (verified owner)

    Fit and finish is DEAD ON with a factory part. Cerakote matches H20 model EXACTLY. RX is doing some great work and this is just another example. Buy it.

  35. Jacob (verified owner)

    Best of the best! Very well made, no burrs or rough edges, perfectly uniform and just feels like it will stand up to anything. Fit and finish are second to none. Color match could not be any closer, can barely notice the slight difference. Looks so much better than the factory limiter!

    Image #1 from Jacob
    • Robb Hutzal (store manager)

      Thanks Jacob, cerekote can look different in all types of lighting, which effect the colour depending on the light in the environment you’re in. We spent a lot of time fine tuning it to match the parkerized OEM tube as close as we possibly could in multiple lighting situations. Glad you are enjoying it!

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