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The Fortis Standard Castle Nut is one of those small upgrades that quietly adds up on a lightweight AR-15 or AR-308 build. Machined from a solid piece of aircraft-grade 7075-T6 billet aluminum, it swaps out that heavier steel nut and lands at just 0.2 ounces, which is about a third of what a standard mil-spec steel castle nut weighs. When you're chasing every ounce on a build, the receiver extension area is an easy place to shave a little fat without touching function.
This nut threads onto any standard mil-spec buffer tube, so there's no guessing about fit. The higher grade of aluminum does the same job as steel here, keeping your endplate and buffer tube locked in place under recoil. The castle cuts follow the standard pattern, meaning your usual AR armorer's wrench or multitool grabs it just like any other nut. The smaller notches also give you a clean recess to stake your endplate into, which is the right way to keep everything from backing out over time.
Fortis finishes it in Type III hardcoat anodize, the tough matte black coating you want on a part that sees repeated wrench contact and general handling. It's cut and coated right here in the USA, and the machining quality is what you'd expect from Fortis, which is to say clean threads and crisp cuts that make install painless.
Installation is exactly the same as a factory nut. Torque it down with a standard stock wrench, stake the endplate, and you're done. If you're putting together a featherweight rifle or just like matching billet components across your lower, this is a simple, no-drama way to knock a little weight off the back end of the gun.
Yes, it threads onto any standard mil-spec receiver extension, so it works with the vast majority of AR-15 and AR-308 lowers. As long as your buffer tube is mil-spec rather than commercial, this nut lines right up. If you're unsure which tube you have, mil-spec tubes measure about 1.148 inches at the threads.
The Fortis nut weighs about 0.2 ounces, roughly a third of what a standard steel mil-spec castle nut weighs. On its own it's a small number, but it's one of several billet swaps people stack together on a featherweight build. It's an easy place to trim a bit without any effect on function.
No, it installs exactly like a factory steel nut using a standard AR stock wrench or castle nut multitool. The castle cuts follow the normal pattern, so your existing armorer's wrench grabs it just fine. After torquing it down, stake your endplate into the notches to keep everything from backing out.
Fortis uses aircraft-grade 7075-T6 aluminum, which is a high-strength alloy that handles the job of retaining your endplate and buffer tube well. For standard use it holds up without issue when installed and staked correctly. Steel is the traditional choice, but this billet version is built to give you the weight savings without giving up reliable retention.
| UPC | 810103343054 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | CN-Stand |
| Color | Black |
| Product Type | Castle Nut |
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