The Angstadt Arms 10 Oz AR-15 Buffer Kit With Spring 9mm Luger/.40 S&W/.45 ACP Black is an extra-heavy blowback buffer system engineered to tame the sharp cycling of pistol-caliber AR builds. Designed specifically for 9mm, .40 S&W, and .45 ACP AR-15 platforms, this 10 oz buffer works with both GLOCK- and Colt-style magazine lowers and installs into a standard carbine-length receiver extension. The 4" steel buffer features a black finish with a blue bumper and is paired with a matching carbine buffer spring to keep your PCC running smoothly.

This kit is ideal for shooters tuning a pistol-caliber carbine for softer recoil, flatter tracking, and more controlled ejection, especially on suppressed builds where bolt speed can become excessive. By adding significant mass to the reciprocating assembly, the buffer helps keep the action closed longer and smooths out the impulse shot to shot. Whether you are setting up a dedicated range gun, competition PCC, or a training carbine that mimics your duty pistol, this Angstadt Arms buffer kit offers a simple drop-in upgrade backed by the brand’s reputation for thoughtful PCC components and precise machining.

Key Features:

• Manufacturer: Angstadt Arms
• Model: AA40BUFKIT Buffer Kit
• Caliber: 9mm Luger, .40 S&W, .45 ACP (AR-15 platform)
• Condition: New
• Action: Blowback-operated PCC compatible
• Finish Color: Black
• Barrel Length: Not applicable
• Number of Magazines: Not applicable
• Capacity: Not applicable
• Optic Footprint: Not applicable
• Unique Features: 10 oz extra-heavy buffer, 4" buffer length, blue bumper, includes carbine buffer spring and spacer, compatible with GLOCK and Colt style magazines
• Night Sights: Not applicable
• External Safety: Not applicable
• Threaded Barrel: Not applicable
• What's In The Box: 10 oz buffer, carbine buffer spring, spacer
• Weight: 10 oz buffer
• Length: 4" buffer length
• Width: Not specified