Angstadt Arms AA45BUFKIT 8oz Buffer Kit 9mm Luger / 45 ACP AR-15 - Black

The Angstadt Arms AA45BUFKIT is a complete 8 oz pistol-caliber buffer kit designed for 9mm Luger and 45 ACP AR-15 builds. It packages the buffer, spacer, and spring together so you can drop in a proven setup and get an AR9 or AR45 cycling reliably without trial-and-error component matching.

The centerpiece of the kit is a heavy 8 oz extended buffer, the weight Angstadt Arms specifically recommends for 45 ACP AR platforms and a proven choice for 9mm as well. A dedicated buffer spacer sets the correct ride height inside a carbine-length buffer tube, paired with a standard AR-15 carbine-length buffer spring. All steel components ship in a clean black finish that blends with any AR build.

The AA45BUFKIT works with AR-15 platforms chambered in 9mm Luger, 40 S&W, and 45 ACP, and is compatible with both Glock-style and Colt-style magazine assemblies. The added buffer mass makes it an especially popular choice for suppressor hosts, where heavier bolt loads and additional back pressure need to be tamed. Whether you are finishing a dedicated pistol-caliber carbine, dialing in an AR pistol build, or replacing worn recoil components, this kit delivers the proven weight and spring combination needed for smooth, reliable function.