Mil-Spec AR-15 Butt Stock Build Kit

Complete your lower receiver build with the Mil-Spec AR-15 Butt Stock Build Kit from Miami Shooters Supply. This kit provides all the essential components you need to install a functional, reliable butt stock on any Mil-Spec AR-15 buffer tube. It’s the perfect solution for builders finishing a new rifle, replacing worn parts, or keeping a spare kit on the bench. You get genuine Mil-Spec quality and compatibility, ensuring a correct fit and dependable performance, shipped fast to get your project done.

Key Features

• Includes all necessary small parts: stock lock, buffer retainer, buffer retainer spring, and rear takedown pin detent and spring.
• Designed specifically for use with standard Mil-Spec diameter receiver extension tubes.
• Manufactured to U.S. military specification tolerances for guaranteed interchangeability.
• Ideal for assembly, repair, or as a critical spare parts kit for your range bag.
• Prevents common installation headaches by providing the correct springs and detents in one package.

Built For

This kit is built for the practical AR-15 owner who values correctness and reliability. It’s essential for anyone assembling a lower receiver from scratch, as these small parts are easy to lose during installation. It’s also a smart buy for armorers and seasoned shooters who maintain multiple rifles and want to have proven spares on hand.

Specifications

• Compatibility: Mil-Spec AR-15 receiver extensions (buffer tubes).
• Includes: Stock lock, buffer retainer, buffer retainer spring, rear takedown pin detent, rear takedown pin detent spring.
• Material: Steel components with spring steel springs.
• Finish: Phosphate coated for corrosion resistance and durability.

FAQ

Is this kit compatible with commercial-spec buffer tubes?
No, it is not. This Mil-Spec AR-15 Butt Stock Build Kit is designed specifically for the slightly smaller diameter of military-specification buffer tubes. Using it with a commercial-spec tube will result in an improper fit.

Does this kit include the buffer and buffer spring?
No, it does not. This kit includes only the small hardware required to lock the stock onto the buffer tube and retain the buffer assembly. The buffer and recoil spring are separate components.