Complete Upper Build Kits

Get everything you need for your next AR-15 build with our complete upper build kits. Our kits include upper receivers, barrels, bolt carrier groups, charging handles, gas blocks, handguards, muzzle devices, and more. Choose from a variety of calibers, lengths, and styles to customize your gun. Shop now and take your AR-15 to the next level with our complete upper-build kits.

DTT "Gateway" 9" AR-15 .300 Blackout Pistol Complete Upper W/: Ballistic Advantage and Phase5

~~$674.99~~ $389.99 Sale

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OTD Customs 'Last Breath' 20" LR-308 6.5 Creedmoor Nitride Rifle Complete Upper Build Kit

~~$749.99~~ $434.99 Sale

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Davidson Defense "The Invader" 9" AR-15 .300 BLK OUT Pistol Nitride Complete Side Charging Upper Build

~~$664.99~~ $349.99 Sale

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Davidson Defense "Konkurs" 16.5" AR-15 5.56 Nitride Complete Upper Build Kit

~~$584.99~~ $299.99 Sale

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Omega Customs 'Huron' AR-15 Pistol Complete Upper Build Kit Featuring Davidson Defense Upper 9MM 8.5" 4150 CMV QPQ Nitride 1-10T 9" M-Lok Handguard (Assembled or Unassembled)

~~$629.99~~ $344.99 Sale

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Davidson Defense 'Armada' 16" AR-15 .350 Legend NIT Complete Build Kit

~~$559.99~~ $274.99 Sale

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Davidson Defense 'Aviere' 16" AR-15 .350 Legend NIT Complete Build Kit

~~$549.99~~ $264.99 Sale

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Davidson Defense 'Leone' 16.5" AR-15 9MM Nitride Complete Upper Build Kit

~~$584.99~~ $269.99 Sale

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Davidson Defense 'Albatros' 16" AR-15 .350 Legend NIT Complete Upper Build Kit

~~$574.99~~ $289.99 Sale

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Davidson Defense 'Crusader' 5.25" AR-15 9MM Nitride Complete Upper Build Kit

~~$574.99~~ $259.99 Sale

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Davidson Defense 'Yugure' 5.25" AR-15 9MM Nitride Complete Upper Build Kit

~~$559.99~~ $244.99 Sale

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Davidson Defense 'Heysel' 16" AR-15 9MM Nitride Complete Upper Build Kit

~~$594.99~~ $279.99 Sale

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OTD Customs 'Aeroboto' 7" AR-15 9MM Pistol Nitride Complete Upper Build Kit

~~$674.99~~ $359.99 Sale

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DTT 'Wiesel I' 16" AR-15 6.5 Grendel Nitride Complete Upper Build Kit

~~$649.99~~ $334.99 Sale

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Davidson Defense 'Paciencia' 20" AR-15 6MM ARC Stainless Complete Upper Build Kit

~~$739.99~~ $424.99 Sale

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DTT 'Cheetah' 8" AR-15 5.56 Pistol Nitride Complete Upper Build Kit W/ Ballistic Advantage

~~$584.99~~ $299.99 Sale

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Davidson Defense 'Tardigrade' 6" AR-15 9MM Pistol Nitride Complete Upper Build Kit

~~$569.99~~ $284.99 Sale

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Davidson Defense 'Valiant' 16" AR-15 9MM Nitride Complete Upper Build Kit

~~$589.99~~ $274.99 Sale

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Davidson Defense 'Kobra' 20" LR-308 .308 Win Stainless Rifle Complete Upper Build Kit

~~$774.99~~ $459.99 Sale

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Davidson Defense 'Lightshow II - Purple' 16" AR-15 5.56 NATO Nitride Rifle Complete Upper Build Kit

~~$609.99~~ $294.99 Sale

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Davidson Defense 'Lightshow II - Red' 16" AR-15 5.56 NATO Nitride Rifle Complete Upper Build Kit

~~$604.99~~ $289.99 Sale

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Davidson Defense 'Lightshow II - Black' 16" AR-15 5.56 NATO Nitride Rifle Complete Upper Build Kit

~~$609.99~~ $294.99 Sale

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DTT 'Nebulous' 20" LR-308 .308 Win Stainless Rifle Complete Upper Build Kit

~~$749.99~~ $434.99 Sale

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DTT 'Eryx' 18" LR-308 .308 Win Nitride Rifle Complete Upper Build Kit

~~$759.99~~ $444.99 Sale

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The AR-15 is one of the most popular rifles in the United States, and for good reason. It's versatile, reliable, and can be customized to meet the needs of almost any shooter. One of the easiest ways to customize your AR-15 is by building your upper receiver using a complete upper-build kit. In this article, we'll explain what a complete upper build kit is, why you might want to purchase one, and what to look for when shopping for one.

What is a Complete Upper Build Kit?

A complete upper build kit is a collection of parts that you need to build the upper receiver of an AR-15 rifle. The upper receiver is the part of the gun that houses the bolt carrier group, charging handle, and barrel. Building your upper receiver can be a great way to customize your gun to your exact specifications. Complete upper-build kits typically include the following parts:

Upper Receiver: The upper receiver is the main component of the upper assembly. It's the part that attaches to the lower receiver and holds all the other parts.

Barrel: The barrel is the long, cylindrical metal tube that the bullet travels through when fired. It's one of the most important parts of the gun, as it determines the accuracy and velocity of the bullet.

Bolt Carrier Group: The bolt carrier group is the heart of the gun. It's responsible for feeding, firing, and ejecting the rounds.

Charging Handle: The charging handle is the mechanism used to manually load the first round into the gun.

Gas Block and Gas Tube: The gas block regulates the flow of gas from the barrel to the gas tube, which in turn powers the bolt carrier group. The gas tube carries gas from the gas block to the bolt carrier group.

Handguard: The handguard is the part of the gun that covers the barrel and provides a place to hold onto the gun.

Muzzle Device: The muzzle device is the part of the gun that attaches to the end of the barrel and helps to control the recoil and muzzle rise.

Forward Assist and Ejection Port Cover: The forward assist is a button on the upper receiver that is used to manually push the bolt carrier group forward if it does not fully close. The ejection port cover is a small metal flap that covers the ejection port to prevent debris from entering the gun.

Why You Might Want to Purchase a Complete Upper-Build Kit There are several reasons why you might want to purchase a complete upper-build kit. Here are a few:

Customization: Building your upper receiver allows you to customize your gun to your exact specifications. You can choose the parts that best fit your needs, such as a longer barrel for increased accuracy or a shorter handguard for a more compact size.

Cost: Building your upper receiver can be more cost-effective than buying a pre-built upper. You can choose the parts that fit your budget and avoid paying for features you don't need.

Education: Building your upper receiver can be a great learning experience. You'll gain a deeper understanding of how your gun works and how each part contributes to its performance.

In conclusion, The AR-15 is an iconic rifle that has captured the hearts of American gun enthusiasts everywhere! Whether you're a seasoned shooter or just starting out, this rifle's versatility and reliability are unmatched. And what better way to make it truly your own than by building your own upper receiver using a complete upper build kit? With a complete upper build kit, you can choose the parts that best fit your needs and preferences, including the barrel, bolt carrier group, charging handle, gas block and tube, handguard, muzzle device, and more. Plus, building your own upper receiver is not only cost-effective, but also an exciting and educational experience. So why settle for a pre-built upper when you can create your very own, one-of-a-kind masterpiece? Just be sure to choose a high-quality kit that's compatible with your lower receiver, and you'll be on your way to building the perfect AR-15 for you!

Complete Upper Build Kits

Products [199]