MXT Shotgun Magazine Extension Kit, 12ga.

5 out of 5 based on 6 customer ratings
(6 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

12ga Brands

Browning BPS, Mossberg 590, 835, 930, 935, Winchester SX2/SX3, FN SLP, Browning Gold/Silver, Benelli M1, M2, SBE, SBE2 (does not fit Nova or Super Nova), Remington 1100, 1187, 870, Versa Max, V3, Stoeger Model 2000, Franchi I-12, Affinity, Intensity, Browning A5 (2012+), Winchester SXP, Winchester 120, 1200, 1300, Stevens 320, Benelli: Nova/SuperNova, Beretta: 1301/391 Xtrema/ 391 Xtrema II, A400/A400 Xtreme (not A400 Xplor or Xcel), CZ: 712, 912, Weatherby SA-08, Remington 887, Stoeger M3000, Stoeger M3500

Adds to your factory magazine capacity

+1, +2, +3, +3B (for flush fit on 18.5″ barreled Benelli M1, M2), +4, +5, +5B (for flush fit on 21″ barreled Benelli M1, M2), +6, +7, +7B (for flush fit on 26″ barreled Benelli M1, M2), +8, +8B (for flush fit on 28″ barreled Benelli M1, M2), +9

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

  1. 5 out of 5


    Excellent fit and finish.

  2. 5 out of 5


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

  3. 5 out of 5


    Fits perfect with no issues thanks for having such great products

  4. 5 out of 5


    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. 5 out of 5


    The standard that all other magazine tubes are judged against.

  6. 5 out of 5


    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.

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