Nordic Components +4 MXT Shotgun Magazine Extension Tube Kit – 12 Gauge
Not Yet Rated | Write the First Review SKU: 222-NOR-MXT-TBS-12-4K
UPC: 816696000000

Nordic Components +4 MXT Shotgun Magazine Extension Tube Kit – 12 Gauge

More Rounds. More Reach. Mission-Ready Expansion.

Whether you’re stepping into a 3-Gun competition, prepping for duty use, or upgrading your defensive shotgun, the Nordic Components +4 MXT Extension Tube Kit gives your 12-gauge a serious capacity boost—adding four extra rounds with uncompromising reliability and modular design.

Crafted from 6061-T6 anodized aluminum and engineered for balance, strength, and repeatable fit, the MXT system is trusted by competitors and professionals worldwide. This +4 kit includes a precision-machined extension tube, end cap, and full-length spring—everything you need to extend your magazine and elevate your firepower.

⚠️ Requires MXT Extension Nut (sold separately) to attach to your shotgun’s magazine tube.

Key Features

• +4 Capacity for 12 Gauge Shotguns
  Increases your existing magazine capacity by 4 rounds using standard 2.75” shells. Adjust capacity if using 3" or 3.5" shells.

• Durable & Lightweight 6061-T6 Aluminum
  Hardcoat anodized for corrosion resistance and structural strength without unnecessary weight.

• Relief Groove for Clamp Stability
  Keeps your barrel clamp from walking—ensures repeatable alignment after maintenance or disassembly.

• Reversible Design for Flexible Fit
  Matching threads on both ends and offset relief groove allow you to reverse the tube for custom clamp positioning.

• Includes Everything You Need
  Comes with extension tube, end cap, and full-length magazine spring (follower and extension nut sold separately).

• Modular & Upgrade-Ready
  Compatible with Nordic’s full MXT system—expand or modify with +1 to +9 configurations.

Compatibility & Fit Notes

• ✅ Fits most 12GA shotguns with compatible MXT extension nuts

• ⚠️ Requires separate MXT Extension Nut (specific to shotgun make/model) for installation

• ⚠️ May require removal of factory dimples or magazine retention devices—especially on Remington and other OEM tubes

Want to know how far this +4 extension will reach past your barrel? Check the Nordic MXT Fit Guide for model-specific info.

Product Specifications

Ideal For:

• 3-Gun competitors looking to shave reload time

• Tactical shooters wanting higher capacity for duty or defense

• Hunters who demand more rounds without sacrificing reliability

• Custom shotgun builders upgrading modular platforms

Why Choose Nordic Components?

Because the MXT system is the most trusted name in shotgun magazine extensions—precision-engineered, field-proven, and fully modular. Whether you're adding +1 or +9, every MXT tube delivers unmatched reliability and rock-solid performance.