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The Fortis Night™ 12.9” KeyMod Rail System delivers the perfect balance of precision, strength, and weight savings for the modern AR-15 builder. Engineered for shooters who demand reliability without compromise, this 5.56 free float handguard combines aerospace-grade materials with Fortis’ signature design excellence.
Every Night Rail is precision-machined from 6061-T6 aluminum, offering unmatched rigidity while keeping weight to a minimum. The patent-pending two-piece barrel nut system ensures complete 360° contact with the barrel, creating one of the most secure and stable mounting systems in the industry. The result is a handguard that installs quickly, stays tight, and performs flawlessly even under the most demanding conditions.
If you want a rail that enhances both performance and aesthetics, the Fortis Night™ 12.9” KeyMod is built to exceed expectations — and redefine your AR-15 experience.
Key Features of the Fortis Night™ 12.9” 5.56 Rail
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12.9” Free Float Design: Reduces barrel stress and improves accuracy by isolating the handguard from the barrel.
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6061-T6 Aluminum Construction: Aerospace-grade alloy delivers superior strength and lightweight performance.
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KeyMod Mounting System: Quickly attach lights, grips, or accessories with direct KeyMod compatibility.
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Patent-Pending Barrel Nut System: Provides 360° locking contact for consistent alignment and zero retention.
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Type III Hardcoat Anodized Finish: Matte black coating ensures exceptional durability and corrosion resistance.
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Perfect Fit for AR-15 Platforms: Works seamlessly with standard mil-spec 5.56 uppers.
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Made in the USA: Designed, machined, and finished to exacting standards right here in America.
Why Choose the Fortis Night™ Rail System
The Night Rail is built around one core principle — performance through innovation. Fortis reimagined what a handguard should be by focusing on structural integrity, installation simplicity, and shooter ergonomics.
The proprietary two-piece barrel nut design ensures complete surface contact, eliminating rotation and flex. It’s one of the most stable systems available, meaning your optics, irons, and accessories stay aligned even during rapid-fire or harsh environments.
Add in the sleek, minimalist KeyMod layout and Fortis’ signature machining lines, and you have a rail that looks as good as it performs. Whether you’re building a precision rifle, a lightweight competition setup, or a duty-grade carbine, the Night Rail is engineered to deliver.
Technical Specifications
| Specification | Detail |
|---|---|
| Model: | Fortis Night™ 5.56MM Rail System |
| Length: | 12.9 inches |
| Material: | 6061-T6 Aluminum |
| Finish: | Type III Hardcoat Anodized |
| Mount Type: | KeyMod |
| System Type: | Free Float |
| Compatibility: | AR-15 / 5.56 Upper Receivers |
| Weight: | Approx. 8.3 oz |
| Made in: | USA |
Installation & Compatibility
The Fortis Night Rail was designed with builders in mind. The included two-piece barrel nut allows for quick installation without special tools or complicated procedures. Simply torque the barrel nut, align, and secure the rail — a process that takes only minutes.
It’s compatible with all standard mil-spec AR-15 5.56 uppers, and the 12.9” length is perfect for mid-length gas systems. The KeyMod slots at the 3, 6, and 9 o’clock positions give you modular mounting options for any configuration, from lightweight carbines to tactical builds.
Customer Reviews
⭐️⭐️⭐️⭐️⭐️
“The machining on this rail is incredible. Lightweight, easy to install, and super rigid. Fortis nailed it again.”
⭐️⭐️⭐️⭐️⭐️
“Rock-solid lockup. I’ve used several rails over the years, and this one stands out in both design and feel. 10/10 would buy again.”
Frequently Asked Questions (FAQ)
Q: Will the Fortis Night Rail fit my AR-15?
A: Yes. The Fortis Night™ 12.9” KeyMod rail fits all standard mil-spec AR-15 5.56 upper receivers and installs easily using the included two-piece barrel nut system.
Q: What’s the difference between the KeyMod and M-LOK versions?
A: The KeyMod version offers a slightly lighter weight and sleek, open-slot design, while the M-LOK model provides broader accessory compatibility. Both share the same strength and precision.
Q: Does this rail work with piston systems?
A: The Fortis Night Rail provides sufficient internal clearance for most low-profile piston systems, including Adams Arms and similar micro setups.
Q: What gas systems work best with the 12.9” model?
A: The 12.9” Night Rail is ideal for mid-length gas systems, offering excellent coverage and balance.
Q: Is the Fortis Night Rail made in the USA?
A: Yes — every Fortis rail is proudly designed, machined, and finished in the USA using aerospace-grade materials and precision CNC processes.
Upgrade Your AR-15 with the Fortis Night™ Rail
The Fortis Night™ 12.9” KeyMod Free Float Rail System is the definition of strength meeting innovation. Lightweight yet durable, it gives your AR-15 the performance edge it deserves.
Whether you’re building from the ground up or refining an existing rifle, the Night Rail delivers precision, style, and confidence with every shot.
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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