Mil-Spec AR-15 Pistol Tube Stock Build Kit

Building a compact and reliable AR-15 pistol requires the right foundation, and that starts with a proper receiver extension. This Mil-Spec AR-15 Pistol Tube Stock Build Kit from Miami Shooters Supply provides the essential, no-frills hardware you need to complete your pistol lower receiver. Designed for builders who prioritize proven specifications and straightforward installation, this kit ensures a solid interface for your pistol brace. Get everything you need in one package with our signature fast shipping.

Key Features

• Mil-Spec 6061-T6 aluminum pistol buffer tube, Type III hardcoat anodized for durability.
• Includes all necessary installation components: castle nut, end plate, buffer retainer, retainer spring, and detent.
• Precision-machined components that meet military blueprint dimensions for reliable fit and function.
• Compatible with all Mil-Spec carbine buffer systems and springs.
• Ideal for building or converting a lower receiver into a compliant AR-15 pistol configuration.

Built For

This kit is built for the practical AR-15 enthusiast who is assembling a pistol-form firearm for home defense, truck use, or as a compact training tool. It’s the go-to choice for builders who trust Mil-Spec components for their proven interchangeability and reliability under stress, without unnecessary weight or cost.

Specifications

• Tube Material: 6061-T6 Aluminum, Hardcoat Anodized Finish.
• Compatibility: Fits Mil-Spec AR-15 lower receivers; for use with pistol braces only.
• Thread Pattern: Standard 1-3/16″-16 thread for castle nut attachment.
• Includes: Buffer Tube, Castle Nut, End Plate, Buffer Retainer Pin, Retainer Spring, and Detent.
• Intended Use: AR-15 Pistol Builds (Note: Not for use with rifle stocks on a pistol lower).

FAQ

Is this kit compatible with any AR-15 lower?
Yes, this Mil-Spec AR-15 Pistol Tube Stock Build Kit is designed to fit any Mil-Spec AR-15 lower receiver. It is not compatible with commercial-spec receiver extensions.

Does this kit include a buffer and spring?
No, this kit includes the tube and all small parts for attaching it to your lower receiver. You will need to purchase a carbine buffer and buffer spring separately to complete your lower build.