Faxon Receiver Lock Nut / Castle Nut

Faxon^® Receiver Lock Nut / Castle Nut AR-15 Castle Nut

Secure Receiver Extension Lock-Up for AR-15 Platforms

The Faxon^® AR-15 Castle Nut is a precision-machined component designed to secure the receiver extension (buffer tube) to the lower receiver. Built for reliability and consistent fitment, it provides a solid interface for maintaining proper alignment of your AR-15 stock assembly.

Durable Steel Construction

Manufactured from steel, this castle nut is engineered for long-term durability under repeated installation and hard-use conditions. Its robust construction ensures dependable retention when properly installed and staked.

Mil-Spec Compatible Fitment

Designed to interface with mil-spec AR-15 receiver extensions, the Faxon castle nut supports compatibility with standard buffer tube assemblies and lower receivers. It integrates seamlessly into both factory builds and custom configurations.

Essential Component for AR-15 Builds

Whether assembling a new rifle or replacing worn hardware, the Faxon^® AR-15 Castle Nut provides a reliable solution for securing your buffer system. Proper installation and staking help ensure consistent performance and long-term stability.

Faxon^® AR-15 Castle Nut Specifications

• Platform Compatibility: AR-15
• Interface: Receiver Extension / Buffer Tube
• Compatibility: Mil-Spec AR-15 Components
• Made In: U.S.A.

Reliable Retention for Buffer Tube Assemblies

The Faxon^® AR-15 Castle Nut is a simple but critical component that ensures your receiver extension remains properly secured. Built to Faxon’s standards for fit and durability, it’s a dependable choice for both new builds and maintenance replacements.

Compatibility Notice: Designed for AR-15 platforms using mil-spec receiver extensions. Always ensure proper torque and staking during installation for optimal retention.