The Armaspec Arm6521-Odg Self-Retention Caste Nut/Al is a purpose-built AR buffer system component designed to secure your receiver extension with a clean, low-profile footprint. Machined from aluminum and finished in an od green tone, it offers a precise fit for compatible AR platforms while keeping weight to a minimum.

This self-retention castle nut is ideal for builders and enthusiasts who want a dependable way to lock down their buffer tube without unnecessary bulk. It suits general range use, training, and duty-style builds where consistent performance and straightforward installation matter. The design reflects Armaspec’s focus on practical innovation and quality machining in small parts and components.

Key Features:

• Manufacturer: Armaspec
• Model: ARM6521-ODG Self-Retention Caste Nut/Al
• Category: AR buffer system component
• Color: OD green
• Material: Aluminum