MXT Shotgun Magazine Extension Kit, 12ga.

Rated 5.00 out of 5 based on 10 customer ratings
(13 customer reviews)



Product Description

Complete MXT shotgun magazine extension kit for increasing magazine capacity.

  • Anodized 6061 aluminum for strength and weight
  • Available in a variety of lengths providing capacity increases of +1 to +9 for all major brands and most models
  • Features relief groove to eliminate barrel clamp travel and ensure repeatable placement after disassembly (+2 through +9 extensions only)
  • Relief groove located off-center to allow location adjustment by reversing the tube
  • Machined with matching thread pitch on both ends to allow reversing the tube

Barrel_Ext_Measurement_Illustration2 Barrel_MXT_Clamp_Groove_Location

All capacities are measured with 2.75″ star-crimped shells.

Note:  May require modification of shotgun for installation and/or proper function.  Any spring/follower retention devices will have to be removed to allow extension to function. Most Remington shotguns will have dimples in the factory magazine that will need to be removed.

Attention Washington, D.C. Residents: We will not ship any magazine tube extension or magazine extension tube component into Washington, D.C. due to current regulations.

Additional Information

Weight N/A
Dimensions N/A
12ga Brands

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Adds to your factory magazine capacity

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13 reviews for MXT Shotgun Magazine Extension Kit, 12ga.

  1. Rated 5 out of 5

    Luis Martinez (verified owner)

    Excellent fit and finish.

  2. Rated 5 out of 5

    Jeff Davidson

    Best extention on the market smooth follow up shots with no jamming ..good job

  3. Rated 5 out of 5


    Fits perfect with no issues thanks for having such great products

  4. Rated 5 out of 5

    Brandon marsh

    Added the +9 to my 1187 and it’s all that I could have hoped for!! Amazing construction great job keep up the amazing work!!

  5. Rated 5 out of 5

    Matthew Koopikka

    The standard that all other magazine tubes are judged against.

  6. Rated 5 out of 5

    Eric B

    Purchased the +7 for a Remington 870 Wingmaster 2 3/4″ and it worked perfectly. Very easy to install, just removed old cap and spring, inserted coupler, new spring, and cap. As recommended for the 870, I purchased the bracket which secures the tube to the barrel. As per the instructions, I trimmed off several inches of the spring until I was able to load 11 rounds into the tube. Worked great for Three Gun Event.

  7. Rated 5 out of 5

    Elpidio Simon (verified owner)

    Exceptional quality.the +3 actually added +4 on my Benelli Nova using 2 3/4 shells. Would definitely recommend and buy again.

  8. Paul Bellamy

    Got the +5 for my Beretta 1301 Competition through Brownells. It went on easily and works flawlessly even with the stock magazine follower still in place.

  9. Rated 5 out of 5

    Jim Kelley (verified owner)

    Purchased +9 for my new Benelli SBE3 holds 12 3 inch 13 2 3/4 excellent quality, fit and finish. A little over priced in my opinion.

  10. Anthony Amburgey (verified owner)

    Put a whole new tube on my 930 jm pro to get more capacity and added the plus one mxt cap and it seems to work as advertised. Was 8+1 now 10+1

  11. Phillip (verified owner)

    I added this to my Benelli M2 I could be more pleased with the fit and finish it looks and functions like it came from Benelli.

  12. Rated 5 out of 5

    We Chia (verified owner)

    Got a +9 round tube for my M3500 Stoeger, it’s legit, no problem at all. Feed just right, if anyone is planning to buy, just leave an extra room for the spring. You have to cut the spring, but leave some extra inches for the spring.

  13. Rated 5 out of 5

    jaimem (verified owner)

    Easy to install and works perfectly, i like easy

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