Sale
AR-15 5.56 Nato 16" Rifle Upper Complete Build Kits (Unassembled Black Barrel Upper) -BLK
Shooters Gate
$479.99
$259.19
(24 reviews)
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Shooters Gate
AR-15 5.56 Nato 16" Rifle Upper Complete Build Kits (Unassembled Black Barrel Upper) -BLK
- OVERVIEW -
The Shooters Gate AR-15 Unassembled Rifle Build Kit provides a solid
Mil-Spec foundation for a dependable 5.56 NATO build. It includes a forged
7075-T6 upper receiver, a 16" 5.56 barrel with a 1:8 twist and mid-length
gas system, and a 15" free-float M-LOK handguard for stability and
accessory mounting.
The kit also features a USA-made BCG, standard charging handle, complete lower parts kit, and a Mil-Spec buffer tube assembly. Bonus tools—an armorer’s wrench, gun mat, and sling—are included to support assembly. Only a stripped lower receiver and magazine are required to complete the build.
The kit also features a USA-made BCG, standard charging handle, complete lower parts kit, and a Mil-Spec buffer tube assembly. Bonus tools—an armorer’s wrench, gun mat, and sling—are included to support assembly. Only a stripped lower receiver and magazine are required to complete the build.
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Upper
Lower
Buffer
Bonus
Complete Upper Assembly Components
Receiver: Forged 7075-T6 Mil-Spec Upper
Barrel: 16" 5.56 NATO, 1:8 Twist
Handguard: 15" M-LOK Free-Float
BCG: USA-Made Bolt Carrier Group
Gas: .750 Gas Block + Mid-Length Tube
Muzzle: A2 Flash Hider
Charging Handle
dust cover Black
forward assist Black
Trigger Parts Kit
Safety Selector
Safety Detent
Safety Detent Spring
Trigger Guard
Trigger Guard Roll Pin
Pistol Grip Washer
Pistol Grip Screw
Buffer Retainer
Retaining Spring
Mag Release
Mag Release Button
Mag Release Spring
Takedown Pins (x2)
Takedown Springs (x2)
Takedown Detents (x2)
Hammer Spring
Hammer Pin
Trigger Spring
Trigger Pin
Bolt Catch
Bolt Catch Plunger
Bolt Catch Spring
Bolt Catch Roll Pin
Disconnector
Disconnector Spring
Trigger Guard Screws
Trigger
Hammer
AR-15 Pistol Grip
Buffer System & Furniture
Mil-Spec Stock
Mil-Spec Buffer Tube
Carbine Buffer & Spring
Castle Nut + End Plate
Bonus Gear
Armorer’s Wrench
Gun Mat
One-Point Sling
Builders Tried Everything. This One Worked.
“Ordered the kit and had it in two days. Built it using a ShootersGate lower — everything fit the way it should. Put about 200 rounds through it with zero malfunctions. Solid kit, no shortcuts taken. I’d recommend it without hesitation.”
★★★★★
Michael T.
Verified Builder
“This was my first build, and it went together pretty easily thanks to the step-by-step guidance provided on the ShootersGate website.”
★★★★★
James R.
Verified Builder
“Best value for the money. Easy to assemble and far better organized than many other kits I’ve worked with. Lightweight, nicely balanced, and feels great once everything is together.”
★★★★★
David L.
Verified Builder
“Bought this for my first AR build and have to say it’s a great kit for the price. I was honestly surprised by how good it looks and how smoothly everything went together. They even included some helpful extras — a sling, a gun mat, and an armorer’s wrench.”
★★★★★
Daniel S.
Verified Builder
“Overall, a really good experience. Shipping was fast and everything showed up as expected. I had a quick question for customer service and they were easy to deal with. I’d buy from ShootersGate again and would recommend them to friends.”
★★★★★
Mark W.
Verified Builder
“This works great. Seems to be good quality and all of the pieces fit perfectly.”
★★★★★
Brian K.
Verified Builder
“Great product. Fast shipping. Everything fit together with ease. Fired beautifully at the range. Very happy with my purchase. Price was extremely reasonable.”
★★★★★
Kevin M.
Verified Builder
“Great kit — first time building an AR-15. Went together easy and shoots good.”
★★★★★
Steven C.
Verified Builder
“This was my first kit, and assembly was very easy. Everything came neatly organized in separate bags, which made the process straightforward. I’d definitely recommend it to anyone considering one.”
★★★★★
Thomas J.
Verified Builder
“Great rifle at a great price. Shipped extremely fast and no problems assembling.”
★★★★★
Anthony P.
Verified Builder
“Everything was as described. Fit and finish was perfect. Easy to install.”
★★★★★
Verdell M.
Verified Builder
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10.5” vs 7.5” vs 16” .300 Blackout Uppers
Choosing between a 7.5”, 10.5”, or 16” .300 Blackout upper depends on your build goal. The 10.5 inch barrel offers a balanced option for pistol builds, while 7.5” prioritizes compactness and 16” favors velocity and range.
| Barrel Length | Best Use | Advantages | Considerations |
|---|---|---|---|
| 7.5” | Ultra-compact pistol builds | Shortest overall length, highly compact | Reduced velocity, louder muzzle blast |
| 10.5” | Balanced pistol configuration | Reliable cycling, good balance of size and performance | Slightly longer than 7.5” |
| 16” | Rifle-length setups | Higher velocity, improved effective range | Not ideal for pistol configurations |
Key Features
| Forged 7075-T6 Upper | Mil-Spec stripped upper receiver (black) |
| 16" 5.56 NATO Barrel | 1:8 twist, mid-length gas (optimized for 55–77 gr) |
| 15" Free-float Handguard | M-LOK compatible for accessories and rails |
| USA-Made BCG | Bolt carrier group manufactured in the USA |
| Complete Lower Parts Kit | Trigger, pins, springs, hammer — ready to install |
| Mil-Spec Buffer Tube & Spring | Carbine buffer and spring included |
| Bonus Gear Included | Armorer’s wrench, gun mat, one-point sling (all free) |
What You Still Need to Complete the Build
| Stripped Lower Receiver | An AR-15 Stripped Lower Receiver (transfer requires FFL & background check as governed by local law) |
| Magazine | A magazine appropriate for your selected caliber |
Package Contents
| ● | Upper Receiver (forged 7075-T6, black, Mil-Spec, stripped) × 1 |
| ● | Barrel — 16" 5.56 NATO × 1 |
| ● | Dust Cover (black) × 1 |
| ● | Forward Assist (black) × 1 |
| ● | Gas Block — .750" × 1 |
| ● | Gas Tube — mid-length × 1 |
| ● | Muzzle Device — A2 birdcage flash hider with crush washer × 1 |
| ● | Handguard — 15" black M-LOK free-float × 1 |
| ● | Bolt Carrier Group (Made in USA) × 1 |
| ● | Charging Handle (black standard) × 1 |
| ● | Lower Parts Kit (trigger, pins, springs, hammer, etc.) × 1 |
| ● | Buffer Tube — black Mil-Spec (commercial set available on request) × 1 |
| ● | Castle Nut (black) × 1 |
| ● | End Plate — black Mil-Spec × 1 |
| ● | Stock — black Mil-Spec with built-in sling adapter (commercial set available on request) × 1 |
| ● | Buffer Spring (standard carbine) × 1 |
| ● | Buffer — carbine buffer × 1 |
| ● | Extra Ambi End Plate (left/right sling options) × 1 |
| ● | Armorers Wrench × 1 |
| ● | Gun Mat (protective assembly/cleaning mat) × 1 |
| ● | One-Point Sling (adjustable) × 1 |
Model: AR-15 Unassembled Rifle Build Kit
Shooters Gate proudly offers this AR-15 Unassembled Rifle Build Kit — it contains nearly all components required to assemble a functioning AR-15 upper and the common lower parts needed for installation.
Complete upper assembly components
USA-made bolt carrier group
5.56 NATO — 1:8 twist (mid-length gas)
WARNING:
WARNING: This product can expose you to chemicals such as lead and other petroleum products which are known to the State of California to cause cancer and birth defects or other reproductive harm.
For more information visit https://www.p65warnings.ca.gov.
Note: Firearm laws and transfer requirements vary by state and locality. It is the buyer's responsibility to ensure compliance with all federal, state and local laws when purchasing and assembling firearm components.
SKU: AR-UBK-16-556
Availability: In stock
FAQ
Is a 10.5 inch barrel good for .300 Blackout?
Yes. .300 Blackout is designed to perform well in shorter barrels. A 10.5” barrel offers a strong balance of compact size, reliable cycling, and practical performance for pistol builds.
Why choose a 10.5” upper instead of 7.5” or 16”?
A 10.5” upper provides a middle ground between compactness and performance. It is shorter and more maneuverable than a 16” rifle setup, while offering better reliability and velocity than ultra-short 7.5” builds.
Is this upper fully assembled?
No. This is an unassembled upper build kit. It is intended for experienced builders who want hands-on control over their build. Professional assembly is recommended.
Is this upper compatible with AR pistol builds?
Yes. This .300 Blackout 10.5” upper is commonly used for AR pistol configurations. Compatibility depends on your lower receiver and final setup.
Can this .300 Blackout upper be used for suppressed builds?
300 Blackout is often chosen for suppressed use. Whether this upper is suitable depends on your specific configuration and components. Always follow local laws and regulations.
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$535.99 $428.79Shooters Gate
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Reviews
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Perfect
I bought this kit. I put 150 rounds through it so far without any issues. The quality of the upper is excellent. Overall I’d reccomend it.
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Nice
Ordered this kit and the jig on a Friday and got the following Tuesday. Shipping was great. Once I get it together I will give an update on how it went.
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AR 15 COMPLETE RIFLE BUILD KIT
I assembled this kit to a double star lower. all the components fit perfectly . I fired 80 rounds today, first time out, performed flawlessly. looking forward to purchase one for the wife in the near future! SG is very fast to ship their products! All in all, a good experience!
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AR 15 BUILD KIT
This kid is 100% amazing. Every part was there well-made went together with ease. This was my first build. After I test fired it I fell in love with it even more. Looking to build your first AR this is what you need. Their customer service is awesome. You have a question just call and ask them they’ll answer your question to your satisfaction.
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Solid Build
Solid Build — I will be building another PSA rifle soon!
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VERY IMPRESSED AND HAPPY!
I couldn’t be happier with this rifle, it’s such a nice quality build, and I would recommend this to anyone who is looking for a quality AR-15.
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Would recommend to other builders
Everything fit like it should and the quality feels right. Shipping was fast and the whole process was smooth. I’ve already recommended this kit to a couple friends.
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Fast shipping, no complaints at all
Shipping was much faster than expected and everything arrived well packaged.
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like it
I assembled this kit to a double star lower. all the components fit perfectly.