This is a AR-15 5.56 NATO upper with Yankee Hill Diamond Fluted Chromed-lined steel barrel. What you see is what you get! Mil-spec upper receiver with M4 Feedramps with Yankee Hill Tactical Diamond Four Rail Free Float Forearm. YHM barrel in 1-7" twist. We check headspace and Test Fire after Final assembly. This barrel will stabilize all 223 or 5.56 NATO bullets from the lightest up to 95 grain. Our customers are reporting that upper assemblies using these barrels are consistently shooting 1 moa! DOES include bolt and carrier, or charging handle. 

Machined, 7075, T6 aluminum, upper receiver, with a 5" long flattop rail, accepts Picatinny-style rings and your tactical accessories. Finished with mil-spec, hard-coat, black anodizing for protection from scratches, mars, and abrasion. Includes case deflector, port cover, and forward assist.

We are a FFL licensed manufacturer, but this upper can be shipped to an individual – no need to transfer through FFL. You are responsible to know the laws in your area!

Precision Firearms M4 Flattop Upper
Yankee Hill 1 in 7" twist 16.5” Chrome lined Steel Barrel

Precision Firearms Bolt and Carrier Group

Precision Firearms Charging Handle

Baffle Muzzle Brake
Yankee Hill Diamond Midlength Four Rail Free-float forearm with finish ring

Low Profile Steel Gas Block

Stainless Steel Gas Tube

Feel free to ask all the question you have. We take the time to answer them all!