AR-15 Mil-Spec Buffer Tube Castle Nut

Secure your buffer tube and receiver end plate with complete confidence using the AR-15 Mil-Spec Castle Nut. Engineered to strict military specifications, this critical lower receiver component ensures your buffer assembly stays firmly locked under sustained recoil and heavy firing schedules.

Machined from high-strength 4140 tool steel, this castle nut delivers maximum thread durability and impact resistance. It features precision-cut staking notches along the perimeter, allowing for clean, reliable staking against your receiver end plate to prevent backing off or loosening over time.

Designed with standard thread pitch and outer dimensions, it fits seamlessly onto any Mil-Spec AR-15, AR-9, or AR-10 carbine buffer tube. Finished with a durable protective coating, it provides exceptional resistance against rust, corrosion, and wear.

Key Features & Specifications:

• 4140 Tool Steel: Machined from heat-treated 4140 tool steel for superior strength and long service life.
• Mil-Spec Tolerances: Manufactured to exact military specifications for universal compatibility.
• Precision Staking Notches: Designed with deep staking grooves for secure, reliable lockup against receiver end plates.
• Corrosion Resistant: Protective finish defends against wear, rust, and harsh environmental exposure.
• Universal Carbine Fit: Fits all standard Mil-Spec AR-15, AR-9, and AR-10 carbine buffer tubes.