• 2-piece barrel nut that provides 360-degree contact
  • Free float rail design
  • M-LOK attachment points
  • No visible screws on the rail system
  • Barrel nut and mounting hardware included

This Fortis NIGHT Rail is the M-LOK Model, if you need the KeyMod model, please check out the Fortis NIGHT Free Float KeyMod Rail System.


  • Material:
    • Rail: Aircraft Grade 6061-T6 Aluminum
    • Barrel Nut: 4140 Steel
  • Finish: Mil-Spec Type III Hard Coat Anodized
  • Height: 2.35"
  • Width: 2.25"
  • Internal Diameter: 1.35"
  • Weight (with barrel nut):
    • 10-Inch: 12.2 oz.
    • 12-Inch: 12.9 oz.
    • 14-Inch: 13.9 oz.
    • 16-Inch: 14.6 oz.
  • Actual Length:
    • 10-Inch: 10.5"
    • 12-Inch: 12.875"
    • 14-Inch: 14.437"
    • 16-Inch: 16"


  • Mil-Spec AR-15 upper receivers


  • 1x Fortis NIGHT Free Float M-LOK Rail System
  • 1x Two-Piece Barrel Nut
  • 1x One-Time Use Barrel Nut Wrench
  • 2x Installation Pins
  • 1x Locking Insert
  • 1x Locking Insert Retaining Screw


If you want a lightweight, American made handguard for your AR 15 that offers you a variety of mounting options for your accessories, the Fortis NIGHT Rail is the perfect fit for your build. This handguard performs flawlessly and brings a refined look to your rifle that other handguards just can’t compete with. The Fortis NIGHT Rail is available in 12 and 14-inch lengths to fit your preferred barrel length.

Thanks to Fortis MFG’s obsession with innovative design, the Fortis NIGHT Rail brings you everything you need in an M-LOK rail system. The handguard not only provides the protection you need but also extends your top rail’s usable mounting space to its full 10 or 16-inch length. Add the convenience and speed of M-LOK rail mounting slots to the package and you have a superior product that offers protection, all the mounting options you need and looks great doing it.

Fortis leaves nothing to chance, their patented barrel nut and NIGHT rail are supplied complete with the tools you need to properly complete the mounting process. Fortis’ supplied wrench mounts directly to your torque wrench and common breaker bar. After timing the barrel nut assembly and properly mounting it simply slide the handguard into place and use the included tightening pins to hand-tighten the forward portion of the barrel nut completing the installation process.

The Fortis NIGHT Rail handguard installs simply, yet the cutting edge design of Fortis’ two-piece barrel nut system creates a secure 360-degree mount contact that ensures a true free floating mount that won’t give in under pressure. It might seem a bit over the top, but the machining process of the barrel nut system takes nearly as long as that of the rail body itself. Fortis Manufacturing designed this system from the ground up to create a product that performs above and beyond industry norms.

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