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Yankee Hill Machine
Overview
The Yankee Hill Machine 9mm Bolt Buffer (YHM-925-A) is designed as a buffer-only assembly that complements Mil-Spec carbine buffer tubes. It provides the necessary weight and dampening to optimize the cycling of a blowback-operated system, making it essential for reliable function in 9mm AR builds. While primarily used in 9mm configurations, this buffer is often found in builds utilizing a carbine gas system and chambered for 5.56 NATO, ensuring compatibility across various applications.
Yankee Hill Machine 9mm Bolt Buffer YHM-925-A ranked #48 of the 88 buffers builders added on GunPartPicker in August 2026. Builders have been adding it to their builds on GunPartPicker since February 2026. All time, it ranks #85 of the 177 buffers builders have added.
Availability is good: it was in stock at one retailer or another nearly every day in September 2026, and today 4 of the 5 retailers we track have it in stock. Prices barely moved in September 2026, holding around $52, so there haven't been real sales lately. Buying today, the lowest price is $52 at BattleHawk Armory, which matches the best price we saw in September.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
We ranked every buffer by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Buffer Guide →Check it against the live catalog:
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Builds in the community that include the Yankee Hill Machine 9mm Bolt Buffer YHM-925-A
| Build | Parts | Total |
|---|---|---|
 | 27 | $2089.71 |
 | 22 | $1470.58 |
 | 30 | $2983.08 |
 | 26 | $2050.57 |
 | 20 | $783.77 |
2 global ratings
Top reviews
Yankee Hill Machine 9mm bolt buffer works correctly on an AR-9 blowback build. Weight is appropriate for cycling 9mm. Wish they would include a backup detent for the price since these can fly during install. Otherwise function is what you need.
Yankee Hills 9mm bolt buffer is for AR-9 builds running blowback. Inside weights dont rattle. Phosphate finish has slight variation across the body, more matte in some spots than others. Function on a 5 inch 9mm SBR has been reliable for a few hundred rounds.
