The YHM 9mm Stainless Bolt Buffer (brand part no. YHM-925-A) is a stainless steel buffer built specifically for carbine-stock 9mm AR-platform builds. Standard 5.56 buffers are not correctly weighted or sized for a 9mm blowback action, and YHM designed this buffer with extra weight and length to address that directly. The added length helps prevent breakage of the bolt catch, a common failure point on 9mm ARs running an undersized buffer. It ships complete with a mil-spec bumper and weighs 5.9 ounces, giving the bolt carrier group the mass it needs to cycle reliably.

Key Specifications

• Machined from stainless steel.
• Built with extra weight and length specifically for 9mm AR builds.
• Helps prevent bolt catch breakage common on undersized 9mm buffers.
• Includes a mil-spec bumper.
• Weighs 5.9 ounces.

Frequently Asked Questions

Why not use a standard 5.56 buffer in a 9mm build? A 9mm blowback action needs extra weight and length, which this buffer provides to help prevent bolt catch breakage.

How much does this buffer weigh? 5.9 ounces.

Buy the YHM 9mm Stainless Bolt Buffer

Order the Yankee Hill Machine 9mm Bolt Buffer from our Lubbock, Texas gun shop and give your 9mm AR the correctly weighted buffer it needs. It is a direct-fit part among our AR buffer system parts. Add it to your cart for fast, insured shipping direct to your door.