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Yankee Hill Machine
Overview
The Yankee Hill Machine .223 Rem/5.56 Flat Top Stripped Upper Receiver is an essential component for any AR-15 builder looking to create a lightweight, versatile platform. Made from 7075-T6 aluminum, this flat top receiver provides a robust foundation for your upper assembly, allowing for the attachment of various optics and accessories. It’s designed specifically for the 5.56 NATO caliber and is frequently used in builds that feature a rifle-length gas system, making it a popular choice for precision and reliability in various shooting applications.
Yankee Hill Machine .223 Rem/5.56 Flat Top Stripped Upper Receiver, Hardcoat Anodized Matte Black - 110
Yankee Hill Machine .223 Rem/5.56 Flat Top Stripped Upper Receiver, Hardcoat Anodized Matte Black - 110 ranks #32 of the 600 upper receivers builders have added on GunPartPicker so far in September 2026, behind the Spike's Tactical Flat Top Upper w/ Ejection Port Door, 9MM, Black - SFT902D, with about 1 in every 250 upper receivers added to builds. Up from #57 in August. Builds with this upper receiver are nearly all chambered in 5.56 NATO, mostly on mid-length gas (75%, then pistol-length 25%), and nearly all AR-15.
It was in stock most days in August 2026, and today 4 of the 6 retailers we track have it in stock. Prices barely moved in August 2026, holding around $96.29, so there haven't been real sales lately. Buying today, the lowest price is $97 at BattleHawk Armory, which matches the best price we saw in August.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
We ranked every upper receiver by how often it shows up in real builds on GunPartPicker.
Read the guide: Most Popular AR-15 Upper Receivers →Check it against the live catalog:
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Aggregated and anonymized data showing how builders use this product
Builds in the community that include the Yankee Hill Machine .223 Rem/5.56 Flat Top Stripped Upper Receiver, Hardcoat Anodized Matte Black - 110
| Build | Parts | Total |
|---|---|---|
 | 21 | $815.71 |
 | 24 | $1319.05 |
 | 28 | $3324.80 |
 | 25 | $4249.66 |
 | 12 | $499.37 |
| 17 | $1073.19 |
1 global rating
Top reviews
YHM .223/5.56 flat top stripped upper is solid forging at a fair price. Wish it shipped with a forward assist and dust cover - having to source separately adds to the build cost. Anodize is consistent matte black.
