Bravo Company USA Receiver Extension Nut (Castle Nut) – CASTLE-NUT-AR15Bravo Company USA Receiver Extension Nut (Castle Nut) – CASTLE-NUT-AR15
When it comes to building a reliable, accurate, and durable AR‑15 platform, every component counts. The Bravo Company USA Receiver Extension Nut (Castle Nut)—model CASTLE‑NUT‑AR15—delivers the precision engineering and rugged construction that serious shooters demand.
Why Choose the Bravo Company USA Castle Nut?
- Premium Machining: CNC‑precision tolerances ensure a perfect fit with the Bravo Company receiver extension, eliminating play and maintaining headspace integrity.
- Corrosion‑Resistant Finish: A hard‑coat black oxide finish protects against the elements, providing long‑term reliability in harsh environments.
- Enhanced Strength: Made from high‑grade 4140 steel, the nut offers superior tensile strength compared to standard aftermarket alternatives.
- Easy Installation: Threaded to accept a standard AR‑15 bolt, the nut installs quickly with a simple torque wrench or hand‑tightened with a suitable wrench.
- Made in the USA: Proudly manufactured in the United States, supporting domestic production and rigorous quality control.
Key Features & Benefits
Precision Fit for Optimal Performance
The castle nut’s exact 1.5‑inch extension length aligns perfectly with the Bravo Company receiver extension, ensuring a secure lock‑up that enhances barrel‑to‑receiver alignment for improved accuracy.
Secure Lock‑Down Design
Unlike traditional nuts, the castle nut’s beveled edges lock into the receiver extension’s matching groove, preventing loosening under recoil and maintaining zero over thousands of rounds.
Versatile Compatibility
Designed for standard AR‑15 platforms, this nut works seamlessly with most 5.56×45mm, .223 Remington, and 300 Blackout builds while also supporting custom configurations that employ the Bravo Company receiver extension.
Rugged Durability
High‑strength 4140 steel combined with a black oxide coating delivers resistance to wear, corrosion, and heat—critical for tactical, competition, and hunting applications.
Technical Specifications
| Model | CASTLE‑NUT‑AR15 |
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| Material | 4140 High‑Carbon Steel |
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| Finish | Black Oxide (Corrosion‑Resistant) |
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| Extension Length | 1.5 inches (38.1 mm) |
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| Thread Pitch | 1‑in‑16 TPI (standard AR‑15) |
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| Weight | ≈ 0.25 lb (113 g) |
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| Compliance | SAAMI, NATO‑compatible, U.S. Military specifications |
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| Country of Origin | United States of America |
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Installation Guide – Quick Overview
- Ensure the receiver extension is fully seated in the lower receiver.
- Insert the castle nut onto the extension’s threaded portion.
- Rotate the nut clockwise until it engages the locking groove.
- Tighten to the recommended torque of 45–55 in‑lb using a torque wrench.
- Verify that the nut is flush with the receiver surface and that there is no movement.
- Proceed with installing the upper receiver and complete your build.
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*For optimal performance, pair the Bravo Company USA Receiver Extension Nut with the matching Bravo Company receiver extension and a high‑quality bolt‑carrier group.
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