The Guntec USA A2 Buffer Tube Kit (brand part no. A2TUBESET) is a complete rifle-length buffer tube assembly for AR-15 rifle builds. The kit pairs a T6 6061 aluminum A2 buffer tube with a matching A2 buffer and rifle-length buffer spring, giving builders everything needed to finish a fixed A2-stock lower receiver in one purchase. At roughly 11 ounces, the assembly is sized and weighted to standard AR-15 rifle-length specifications, so it drops straight into a mil-spec lower without any fitting work. It’s a straightforward, made-in-the-USA choice for anyone building a rifle-length AR-15 or replacing a damaged factory tube.

Key Specifications

• The kit includes a full A2 rifle-length buffer tube sized to mil-spec AR-15 dimensions.
• A matching A2 buffer is included, so no separate buffer purchase is needed.
• A rifle-length buffer spring is included to complete the buffer assembly.
• The tube is machined from T6 6061 aluminum for a durable, lightweight build.
• It carries a matte finish that matches most AR-15 furniture.
• The complete assembly weighs approximately 11 ounces.
• The kit is made in the USA to standard AR-15 rifle-length specifications.

Frequently Asked Questions

Does this kit include the buffer and spring? Yes, it includes a matching A2 buffer and rifle-length buffer spring along with the tube.

Will this fit a mil-spec AR-15 lower? Yes, it’s sized to standard AR-15 rifle-length mil-spec dimensions.

What stock is this tube meant for? It’s built for fixed A2-style stocks on rifle-length AR-15 builds.

Buy the Guntec USA A2 Buffer Tube Kit

Finish your A2-stock AR-15 build in one order with the Guntec USA A2 Buffer Tube Kit. Shop more Guntec USA gun parts kits and get fast shipping from our Lubbock, Texas gun shop.