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The Nordic MXT +4 Extension Kit gives you straightforward capacity gains without overcomplicating your setup. This kit works with most 12-gauge shotguns when paired with the appropriate MXT extension nut, letting you add four rounds to whatever you're running. It's become the go-to choice for serious competitors and folks who just need more trigger time between reloads.
Machined from anodized 6061 aircraft aluminum, this extension won't weigh you down or add unnecessary bulk. The material gives you the durability you'd expect from a precision-engineered component, along with corrosion resistance that holds up through hard use. Each kit includes the extension tube, a full-length replacement spring, and an end cap ready to install.
The real advantage here is Nordic's three-piece system. The extension tube itself works with any 12-gauge MXT nut, meaning you can swap this between different shotguns as long as you have the right nut for each gun. The design also comes with a relief groove that prevents the barrel clamp from wandering once you've set it, and the tube is reversible so you can position everything exactly where it needs to be for your shotgun and grip setup.
This kit requires an MXT extension nut specific to your shotgun model (sold separately). The nut does the heavy lifting of actually securing the extension to your gun's magazine tube. On some shotguns, you'll need to remove factory dimples or spring retention devices before installation can happen smoothly. Remington shotguns are pretty common here, but it's worth checking your specific model. The spring typically needs trimming during installation to match your shotgun's feeding characteristics, so read the included instructions and don't skip that step.
Yes, you'll need an MXT extension nut that matches your specific shotgun model. The extension tube alone won't attach without it. Nordic offers model-specific nuts for Remington, Mossberg, Benelli, Winchester, Browning, and many others. Some shotguns may also require removal of factory dimples or spring retention devices before installation.
The extension tube itself is universal for any 12-gauge shotgun, but each gun needs its own MXT extension nut to function. If you own multiple 12-gauge shotguns, you can swap the same tube between them by buying the appropriate nut for each model.
The +4 extension measures between 10.1 and 10.5 inches depending on whether you're using 2.75-inch or 3-inch shells. On most shotguns, it will extend slightly past the muzzle. Nordic's fit guide shows specific measurements for different shotgun models to help you plan accordingly.
Most likely yes. The kit includes a full-length spring that needs trimming to match your shotgun's feeding requirements. Nordic recommends leaving about 16 inches of spring extending from the magazine tube as a starting point, though 12 to 16 inches is the safe range. Semi-automatic shotguns especially need proper spring tuning for reliable function.
| UPC | 816696021485 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MXT-TBS-12-4K |
| Color | Black |
| Model | |
| Product Type | Magazine Extension |
| Caliber/Gauge | 12 Gauge |
| Capacity | 4-Round |
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