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
| Feature | Specification |
|---|---|
| Model | MXT +4 Extension Tube Kit |
| Gauge | 12 Gauge |
| Capacity Increase | +4 (with 2.75” shells) |
| Material | 6061-T6 Aluminum (Anodized) |
| Tube Finish | Black Hardcoat Anodized |
| Tube Length | Model-specific – extends past barrel |
| Weight | Lightweight – optimized for performance |
| Spring Included | Yes (Full-Length) |
| Cap Included | Yes |
| Relief Groove | Yes – for clamp retention |
| Reversible Tube Design | Yes – threaded and grooved on both ends |
| Compatibility | Requires MXT Extension Nut (sold separately) |
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.
WARNING: This product can expose you to Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to – www.P65Warnings.ca.gov.
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