Yankee Hill Machine A3 AR-15 Upper Receiver Assembly

Manufactured by Yankee Hill Machine
SKU: YHM-100
MPN: YHM-100
Manufactured by Yankee Hill Machine
14 Reviews

In Stock

Standard orders will ship out 1 business day if ordered by 3:30 pm CST, Monday-Friday. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination.

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The Yankee Hill Machine A3 AR-15 Upper Receiver Assembly is forged from 7075 aluminum that has been T6 heat treated and hard coat anodized (Mil-A-8625A). The A3 features a flattop design with an integral Picatinny style rail and no sights with M4-style feed ramps.

Yankee Hill Machine stands by their products and meticulously inspect each product before they ship it out. Their quality assurance program adheres to strict military standards and use the most modern equipment. Not only are is the inspection equipment state of the art, but they manufacture their own tools to make sure that each part is machined precisely the way it needs to be. They have a highly skilled and diverse workforce that is committed to insure your satisfaction 100%.
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AssemblyAssembled Uppers
BrandYankee Hill Machine
Feed RampsM4
FinishHardcoat Anodized
Forward Assist
Manufacturer.Yankee Hill Machine
Port DoorAssembled with Port Cover
Receiver Material7075-T6 Aluminum
T MarksT-Marked

Ratings & Reviews

14 reviews

  • 4 stars
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  • 1 star
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Yhm a3 upper


Came quickly no blemishes very well put together.

Yankee Hill Machine A3 Upper Receiver


Great quality, very good buy for the price. Will definitely recommend to others.

Great Upper


Great Upper for thr price. Love shopping at Primary Arms.

YHM upper receiver


Never disappointed with anything YHM has put out. Ever.



Nice upper real good fit

Great upper receiver!


No blemishes, evenly anodized, ready to build up. Fast shipping and very well packaged.

Quality products


Placing your order and receiving on a timely manner rates top with primaryarms. Quality products and highly recommend them to get your order on time!

My review on primary arms/ yhm upper


Primary arms I have to say hands down you are awesome. I ordered this lower around 8am then at around 11am I had a email saying it shipped WOW!!! Nice job. As for the upper from YHM works amazingly tight fit with my YHM lower.

Yankee Hill Machine Upper Receiver


The upper and lower were shipped together to the FFL is short order. Both units were very well packaged. The fit and finish is fantastic. Very clean, no burrs, blemishes, or crud anywhere. I am 2 hours into the build with no issues. I would highly recommend the receiver set and Primary Arms. I will do business with Primary Arms again.

Solid product for your next build!


Very happy with this purchase. It was purely "plug and play" and totally mil-spec. Great option for any rifle build!