Description
Fortis set out to build a rail that was lighter and feature-rich without breaking the bank, and the REV II delivers exactly that. This 13.8-inch version tips the scales right around 9.3 ounces, which is impressively light for its length. That comes from a one-piece body machined out of aircraft-grade 6061-T6 aluminum, then finished with a mil-spec Type III hard coat anodizing that holds up to real use. It's made in the USA, and the fit and finish reflect that.
What Sets the REV II Apart from the Original REV
If you're familiar with the first-generation rail, the big change here is how Fortis handled the accessory mounting. The short forward rail sections at 3, 6, and 9 o'clock from the REV I were dropped in favor of continuous M-LOK slots running nearly the full length, plus rotation-limited QD sling swivel sockets built right in. That means more room to hang lights, grips, bipods, sling points, and any other M-LOK gear exactly where you want it, and less weight overall.
Top Rail and Handling on the Fortis REV II
The continuous 1913 mil-spec Picatinny top rail runs flush with your upper, giving you an uninterrupted surface for optics, backup irons, or night vision setups. Plenty of folks describe the way it looks and feels as close to a monolithic upper. It's slim in the hand, well-balanced, and the profile lends itself to a comfortable C-clamp grip for faster, more controlled shooting.
Fitting the REV II Free-Float Rail to Your Build
Installation uses a mounting collar that captures a standard AR-15 barrel nut, so you're not locked into a proprietary system. Anti-rotation tabs keep everything indexed and solid once it's torqued down. Keep in mind the barrel nut is not included, and it's worth using a dedicated barrel nut tool to get proper torque. The rail works with both direct impingement and piston operating systems, so it fits a wide range of setups. It fits most mil-spec forged uppers, though certain enhanced or non-standard uppers may need a look before you order.
Key Specifications
- Manufacturer: Fortis Manufacturing
- Model: REV II
- Manufacturer Part Number: REV-II-14-MLOK
- UPC: 855476008131
- Rail Length: 13.8 in (14.8 in overall)
- Weight: 9.3 oz
- Material: 6061-T6 Aircraft-Grade Aluminum
- Finish: Mil-Spec Type III Hard Coat Anodized
- Color: Black
- Attachment System: M-LOK at 3, 6, and 9 o'clock
- Top Rail: Continuous 1913 Mil-Spec Picatinny
- Inside Diameter: 1.340 in
- QD Sockets: Rotation-Limited QD Sling Sockets
- Mounting: Standard AR-15 Barrel Nut (not included)
- Compatibility: Direct Impingement and Piston
- Country of Origin: USA
What’s Included
- Fortis REV II 13.8 in M-LOK handguard
- Mounting collar and hardware
Frequently Asked Questions
Does the Fortis REV II come with a barrel nut?
No, the barrel nut is not included with the REV II. It's designed to mount to a standard AR-15 barrel nut, so you can use one you already have or pick one up separately. This keeps the system flexible and keeps the cost down since you aren't paying for a proprietary nut.
Will the REV II handguard fit my upper receiver?
It fits most standard mil-spec forged uppers without any trouble. Because of the anti-rotation tabs, certain enhanced or non-standard uppers may require a slight modification or simply won't clear, so it's worth checking your upper before ordering. If you're running a common forged flat-top upper, you should be good to go.
How heavy is the 13.8 inch Fortis REV II?
This length comes in at about 9.3 ounces, which is genuinely light for a rail this long. The weight savings come from the one-piece 6061-T6 aluminum body and all the machining Fortis does to trim excess material. If you're building a lightweight rifle, this rail helps keep the whole setup lean.
Can I use the REV II with a piston system?
Yes, the REV II is compatible with both direct impingement and piston operating systems. That makes it a versatile choice regardless of how your gas system is set up. Just make sure your barrel profile fits within the 1.340 inch inside diameter.





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