APF Armory Mil-Spec AR-15 Castle Nut
Secure your AR-15 buffer tube properly with our Mil-Spec Castle Nut. This essential lower receiver component is
precision manufactured to lock your carbine receiver extension in place and allow proper torquing and staking for maximum reliability.
Key Features:
- True Mil-Spec Dimensions — Manufactured to exact military specifications for perfect compatibility.
- Staking Notches — Deep, properly cut notches designed for secure staking with the receiver end plate.
- High-Strength Steel Construction — Hardened steel for exceptional durability and resistance to loosening under recoil.
- Black Oxide Finish — Corrosion-resistant matte black finish that blends with standard mil-spec components.
- Easy Installation — Works seamlessly with any standard AR15/AR10 carbine buffer tube and receiver end plate.
Whether you're building a new lower, replacing a factory part, or performing maintenance, this castle nut delivers the strength and precision APF Armory is known for. Pair it with our Mil-Spec Receiver End Plate and Carbine Buffer Assembly for a complete, rock-solid setup.
Specifications:
- Material: Hardened Steel
- Finish: Black Oxide
- Compatibility: Standard AR-15 / M4 carbine buffer tubes
- Weight: Approx. 0.3 oz
- Torque Spec: 35-40 ft-lbs (recommended)
American-Made
Lifetime Warranty