Guntec USA Mil-Spec AR-15 Complete Buffer Tube Kit

The Guntec USA Mil-Spec AR-15 Complete Buffer Tube Kit (brand part number MILTUBESET) gives AR-15 builders everything needed to mount a mil-spec compatible stock in one box, instead of sourcing a tube, buffer, spring, end plate, and castle nut separately. Guntec USA machines the six-position receiver extension from aluminum to mil-spec dimensions, then rounds out the kit with a standard 3-ounce carbine buffer and a chrome spring, plus the end plate and castle nut needed for a complete, ready-to-assemble install. It’s a straightforward, no-shopping-list-required foundation for any mil-spec AR-15 stock installation or receiver extension swap.

Key Specifications

• Machined from aluminum for a durable, lightweight tube.
• Uses a six-position mil-spec receiver extension.
• Includes a standard 3-ounce carbine buffer.
• Includes a chrome spring.
• Includes the end plate and castle nut needed for a complete install.

Frequently Asked Questions

Does this kit include everything needed to install a stock? Yes, it includes the buffer tube, buffer, spring, end plate, and castle nut.

What buffer weight is included? A standard 3-ounce carbine buffer.

Buy the Guntec USA Mil-Spec AR-15 Complete Buffer Tube Kit

Get every part you need for your next AR-15 stock install in one kit. Order it from our Guntec USA lineup, part of our gun parts kits selection, at our Lubbock, Texas gun shop for fast, direct shipping.