Angstadt Arms Extra-Heavy AR-15 Buffer Kit

The Angstadt Arms Extra-Heavy Buffer Kit (brand part no. AA40BUFKIT) gives 9mm Luger, .40 S&W, and .45 ACP AR-15 pistol-caliber carbines the added bolt mass they need to cycle smoothly. Angstadt Arms builds this kit specifically for direct-blowback PCC uppers, where a standard rifle buffer runs too light and causes harsh cycling or bolt bounce. The kit ships complete with a matched carbine buffer spring so there is no guessing on spring rate. It is a straightforward drop-in upgrade for anyone running a 9mm, .40, or .45 AR-15 build.

Key Specifications

• The buffer weighs in at 10 ounces, extra-heavy mass that slows bolt velocity for smoother, more controllable cycling in blowback PCC uppers.
• It is finished in black, matching standard AR-15 lower components.
• The kit is rated for 9mm Luger, .40 S&W, and .45 ACP AR-15 platforms, covering the three most common pistol-caliber chamberings.
• It is compatible with both GLOCK-pattern and Colt-pattern magazines, so it works regardless of which mag well your PCC lower uses.
• The kit includes a matched carbine buffer spring, so the buffer and spring are tuned to work together right out of the box.

Frequently Asked Questions

What calibers does this buffer kit work with? It is built for 9mm Luger, .40 S&W, and .45 ACP AR-15 pistol-caliber carbines.

Does it include a buffer spring? Yes, a matched carbine buffer spring ships with the buffer.

Will it work with my Glock-mag AR-15 lower? Yes, it is compatible with both GLOCK and Colt style PCC magazine wells.

Buy the Angstadt Arms Extra-Heavy AR-15 Buffer Kit

Order the Angstadt Arms Extra-Heavy Buffer Kit from Angstadt Arms through our AR-15 buffer systems lineup and get your pistol-caliber carbine cycling the way it should. Our Lubbock, Texas team ships direct and fully insured as soon as it’s ready to go.