LBE Unlimited ARCNUT Castle Nut 4140 Steel Black Phosphate AR-15

The LBE Unlimited ARCNUT Castle Nut delivers enhanced torque retention and simplified installation for AR-15 buffer tube assemblies. This precision-machined component eliminates the need for staking while providing secure attachment through its innovative design.

What Makes This Different

Unlike standard castle nuts that require staking to prevent loosening, the ARCNUT features an integrated retention system that maintains proper torque without permanent modification to the receiver. The 4140 steel construction provides superior strength compared to standard mil-spec castle nuts, while the black phosphate finish offers corrosion resistance and reduces glare. This design allows for easy removal and reinstallation without compromising security.

Key Features

• 4140 steel construction for enhanced durability and strength
• Black phosphate finish resists corrosion and wear
• No-stake design prevents receiver damage during installation
• Standard AR-15/M4 buffer tube threading compatibility
• Integrated retention system maintains proper torque
• Tool-free removal capability for maintenance access
• Precision-machined threads ensure smooth installation

Field conditions demand reliable components that maintain zero shift and consistent performance. The ARCNUT's retention system prevents the gradual loosening common with standard castle nuts during extended firing sessions or harsh environmental conditions. Competition shooters benefit from the ability to quickly access buffer components for tuning without permanent modifications, while tactical users appreciate the enhanced reliability during high round count training.

Technical Specs

• Material: 4140 steel construction
• Finish: Black phosphate coating
• Threading: Standard 1.148"-16 TPI
• Compatibility: AR-15/M4 platform buffer tubes
• Installation: Standard castle nut wrench required
• Weight: Approximately 1.2 oz
• Country of Origin: USA manufactured

The ARCNUT represents a practical upgrade for builders seeking enhanced reliability without complex installation procedures. Its proven retention system and quality materials make it a dependable choice for both precision builds and duty rifles.