Nordic Components 12 Gauge Mossberg Extension Nut

Essential Hardware for Your Mossberg Magazine Extension Upgrade

Ready to extend your firepower? The Nordic Components 12 Gauge Mossberg Extension Nut is the critical component needed to install a Nordic MXT magazine extension tube on your compatible Mossberg 12-gauge shotgun. Replacing the factory magazine cap, this extension nut creates the rock-solid interface between your shotgun and a range of Nordic MXT extension tubes—delivering reliability, precision fit, and competition-level performance.

Whether you’re building a tactical shotgun, prepping for 3-Gun competition, or increasing capacity for home defense, this nut is your foundation for maximum modularity and magazine expansion.

Key Features

• Required for Nordic MXT Extensions
  Allows installation of any Nordic Components MXT extension tube kit on compatible Mossberg 12-gauge shotguns.

• Direct Replacement for Factory Magazine Cap
  Installs in minutes—simply remove the OEM cap and thread on the Nordic nut. No gunsmithing required.

• Precision-Machined for Secure Fit
  Made from durable anodized aluminum for reliable function under recoil and rugged field use.

• Supports a Range of Mossberg Models
  Compatible with most 12ga Mossberg tactical and semi-auto platforms (see compatibility list below).

Compatible Shotguns

This MB-series nut works with the following 12-gauge Mossberg models:

• ✅ Mossberg 590 / 590A1

• ✅ Mossberg 930

• ✅ Mossberg 940

• ✅ Mossberg 835

• ✅ Mossberg 935

• ✅ Tristar TEC-12 (requires barrel lug spacer)

❌ Not compatible with Mossberg 500, 535, or Maverick 88 shotguns

⚠️ May also fit other shotguns that share Mossberg’s mag thread pattern, but custom fitting may be required. Nordic does not guarantee compatibility beyond listed models.

Installation Notes

• Magazine dimples or spring retention devices must be removed or smoothed for proper extension tube function.

• Always consult the MXT Fit Guide or JM Pro FAQ for platform-specific recommendations (especially Mossberg 930 JM Pro users).

Product Specifications

Why Choose Nordic Components?

Nordic Components is the trusted name in modular shotgun upgrades. Their MXT extension system is the top choice among 3-Gun competitors, tactical shooters, and dedicated hunters alike. Built in the USA and engineered for hard use, every component is backed by Nordic’s reputation for excellence.