The UTG 6-Position Mil-Spec AR-15 Stock Assembly (brand part no. RBU6DM) pairs an impact-resistant, high-strength polymer stock with a complete mil-spec-diameter buffer tube assembly, giving builders everything needed to finish the back end of an AR-15 in one box. UTG machines the extension tube from aircraft aluminum with rolled threads, then finishes it in hard anodizing plus a Flat Dark Earth Cerakote coating for corrosion and wear resistance that matches the polymer stock’s color. The assembly is built for heavy-duty operation with tight tolerance control between the stock and tube, and it ships complete with the action spring, buffer assembly, tear-drop sling ring, and castle nut, so there’s no need to source separate hardware. It’s a made-in-the-USA, color-matched way to finish a 6-position AR-15 build in a single purchase.

Key Specifications

• Stock molded from impact-resistant, high-strength polymer.
• Finished in Flat Dark Earth.
• Extension tube machined from aircraft aluminum with rolled threads.
• Tube finished in hard anodizing plus FDE Cerakote for corrosion and wear resistance.
• Built for heavy-duty operation with tight tolerance control.
• Includes the action spring.
• Includes the buffer assembly.
• Includes a tear-drop sling ring.
• Includes the castle nut.
• Adjustable across 6 positions on a mil-spec diameter tube, made in the USA.

Frequently Asked Questions

What’s included in this assembly? The stock, buffer tube, action spring, buffer assembly, tear-drop sling ring, and castle nut.

Does the color match front to back? Yes, the polymer stock and the tube’s Cerakote finish are both Flat Dark Earth.

What size buffer tube does it use? A mil-spec diameter tube with 6 positions of adjustment.

Buy the UTG 6-Position Mil-Spec AR-15 Stock Assembly – Flat Dark Earth

Finish the back end of your AR-15 build in one box, hardware included. Order the UTG stock assembly from our rifle stocks selection at our Lubbock, Texas gun shop for fast, direct shipping.