Guntec USA AR-15 9mm Luger Buffer 4" Stainless Steel

The Guntec USA AR-15 9mm Luger Buffer is a one-piece, US-made buffer purpose-built for 9mm Luger AR-pattern pistol caliber carbines and 9mm AR pistol builds. Correctly weighted and sized buffers are essential in a straight-blowback 9mm AR upper, and this unit is engineered to the right mass and length for reliable cycling with the bolt carrier and spring combinations common to the 9mm AR platform.

The body is machined from stainless steel for corrosion resistance and long service life, paired with a clear polyurethane rear bumper that cushions the buffer against the back of the buffer tube on each cycle. At 8.2 ounces and 4 inches long, the buffer drops into any standard MilSpec receiver extension or pistol buffer tube. Its geometry (approximately 1.05 in high by 2.25 in wide) matches conventional AR buffer dimensions, making it a direct drop-in replacement for the factory unit in a dedicated 9mm build.

Guntec USA designs and finishes this buffer in the United States to give dedicated 9mm AR owners a long-wearing, properly weighted component. Whether you are assembling a new pistol caliber carbine from scratch or replacing a worn or under-weighted buffer in an existing build, the BUF-9 provides the materials, weight, and length a 9mm blowback system needs.