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$179.99
A “naked” 16-inch upper that’s ready for a custom build. This “naked,” barreled 16″ upper ships assembled without a bolt carrier group, charging handle, or handguard — it’s the perfect barreled base upper for building a custom setup, while avoiding “factory” components you’ll replace anyway! Long-range performance is easily derived from this upper’s 4150 CMV,…
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Sale!

$369.99 Original price was: $369.99.$209.99Current price is: $209.99.
This 9mm AR-15 upper’s 16″ barrel isn’t just for show. It gives this ole pistol cartridge the length you need to truly maximize its performance, taking 9mm’s accuracy to never-before-seen distances. Built on a reliable blowback system with a monolithic bolt, 1:10 twist rate, and wrapped in a 15″ M-LOK handguard, this upper is precision…
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$389.99 Original price was: $389.99.$339.97Current price is: $339.97.
If you’re a hunter, you can appreciate the need for a somewhat larger caliber at a more intermediate range. You’ll need a rifle whose ability shines in this area. So check out this LR-308 upper assembly. You get a pre-built side-charging upper assembly that starts with a 16-inch parkerized heavy-profile barrel paired with a 15-inch…
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Rated 5.00 out of 5
$269.99
Please note: We strive to provide the most accurate photographs of our product wherever possible. Due to availability limitations and supply chain constraints, slight variations of the handguard of this upper assembly may occur in the aesthetics of the skeletonizations in between the M-LOK sections. For the long-range shooter who demands a do-it-all AR with…
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$419.99
Build your LR-308 rifle with this kit, and then really stretch out with your shots fired and go the distance. Up close, they’ll be blinded by the luster of your stainless steel barrel and compensator, while off in the distance they’ll hear the clang of your lead slamming steel. This upper assembly comes with a…
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$329.99
Some people love classic things. Some of those classic-loving people love classic firearms. You know the type. They can list every good thing about the 1911 in alphabetical order, or tell ya all about how the M-16 used to “jam like a sumbitch.” They might even have personal experience on the matter. If you’re the…
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$429.99 Original price was: $429.99.$339.97Current price is: $339.97.
Are you ready to step up your .308 long-range game? Then snatch up this LR-308 upper assembly. This upper assembly provides an 18″ mid-weight SOCOM-profiled barrel made from button-rifled 4150 CMV for utter accuracy. It also comes with a 15″ M-LOK handguard for mounting a bipod, foregrip, or whatever else. All you’ll need after assembly…
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$289.99
So you’re half-way done with building your own AR-15. In building the lower assembly, we can tell you the hardest part is over. Because if you can turn a screwdriver, allen wrench, or socket wrench to install backup sights or optics, we’ll take care of building your upper assembly. See? You already did the hard…
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Rated 5.00 out of 5
$309.99
So you’re interested in building your own AR-15, and so far you’ve gotten as far as building the bottom half. But you haven’t quite figured out the top half. Or maybe you have, but haven’t decided on parts. Well, how are you with a screwdriver and installing sights and optics? Because if you can turn…
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Sale!

$329.99 Original price was: $329.99.$279.97Current price is: $279.97.
The M4-profile 4150 CMV barrel in this upper assembly provides MOA accuracy, thanks to a new .223 Wylde chamber that better handles .223 Remington and 5.56 NATO. Now you can safely shoot both. In addition, we went with a free-float, lightweight M-LOK handguard that provides plenty of rail estate for that bipod, tac-light, front BUIS,…
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Sale!

$369.99 Original price was: $369.99.$299.97Current price is: $299.97.
If you’re in the market for a tactical AR9, then we’ve got the perfect upper assembly for you. It’s fitted with a right-side charging handle which will allow you to reload and charge your bolt without removing your right hand from your grip, so you can keep your sights on your target. And with the…
Every AR-15 rifle upper available for sale has been precisely assembled by our team to guarantee MOA accuracy and utter reliability. We work with top gunsmiths and arms makers to configure each upper rifle assembly with the right mil-spec components, the best coatings and barrel treatments, and rugged, accurizing free-float handguards. All rifle assemblies are put together by experienced shooters who properly torque and season barrel nuts, and ensure proper alignment with every handguard.
AR 15 Upper Assembly Features
- 100% U.S. mil-spec construction
- Fully assembled barreled upper receivers
- 5.56/.223, 300 Blackout options available
- Proudly made and assembled in the USA
- Compatible with retail lowers and 80% lowers
Barreled Upper Specifications
- All barrels are forged from MIL-B-11595 E steel (4150 or Chromoly Vanadium)
- All stainless barrels forged from Crucible 416R steel, offering sub-MOA accuracy
- All barreled threaded with standard 1/2×28 threads with A2-type flash hider
- All BCGs are M16 in profile with chrome lining and properly staked gas keys
- All stripped upper receivers forged from mil-spec 7075 T6 aluminum
- All barrels are test-fired to ensure proper accuracy and reliability
- All receivers come with mil-spec Type III anodized coating
State Laws Vary
Contrary to federal law, some states have either restricted or banned the sale, transfer, and ownership of certain firearm parts. Because of these restrictions, we cannot ship our products to certain states. Please confirm whether your state is restricted on our Shipping & Return Policy before placing an order. We cannot fulfill orders to restricted states if placed.
Your rifle build awaits
If this is your first time building a black rifle, check out these two useful guides below:
DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At Gunbuilders.com, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.