AT3™ Assembled Forged Upper for AR-15 – 5.56 NATO – 16″ Barrel – 9″ Free Float Quadrail – No BCG/CH – 3 Colors

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AT3™ Assembled Forged Upper for AR-15 – 16″ 5.56 NATO Barrel with 9″ Free Float Quad Rail – Rosco Bloodline Barrel

Built to Order – Ships Within 3 Business Days

This assembled upper delivers a full-length, reliable platform for AR-15 builds with the proven reliability of quad rail accessory mounting and the properly-gassed performance of a Rosco Bloodline barrel. This is the foundation for shooters building a versatile home defense rifle, duty gun, suppressor host, or all-purpose range blaster where you need the full velocity and reliability of 5.56 NATO without the violent over-gassing of standard M4 barrels. The 9-inch Pro Quad Rail gives you four sides of Picatinny rail for rock-solid mounting of lights, lasers, foregrips, and any other accessories you need without worrying about adapter compatibility.

The 16-inch Rosco Bloodline barrel solves the over-gassed carbine problem with properly engineered gas port sizing that prevents excessive bolt speed and premature wear. Built from 4150 CMV steel with nitride finish, this barrel delivers reliable function without the violent cycling of standard M4 profiles—reducing premature wear from excessive gas while working exceptionally well with suppressors. The 1:7 twist rate stabilizes heavy projectiles, and the carbine-length gas system provides reliable cycling. The 9-inch Pro Quad Rail provides secure accessory mounting on all four sides, is lightened down all four sides for weight reduction while remaining solid enough to handle heavy use, and features five integrated QD sockets for multiple sling mounting options.

Built on AT3’s forged upper receiver with forward assist and dust cover installed, this setup pairs a low-profile .750 steel gas block and stainless gas tube for reliable function. The Mil-Spec A2 flash hider effectively reduces muzzle flash and gives the muzzle a clean, finished look. Engineered with military and consumer input for balanced performance.

Note: Does not include bolt carrier group or charging handle. The upper is shipped fully assembled.

Features

16-inch Rosco Bloodline barrel with properly sized gas port prevents over-gassing
4150 CMV steel with nitride finish for durability
1:7 twist rate stabilizes heavy projectiles
Carbine-length gas system with balanced cycling
Optimized for suppressor use
9-inch Pro Quad Rail with four sides of Picatinny rail for secure accessory mounting
Lightened rail design reduces weight while maintaining strength
Five integrated QD sockets for multiple sling configurations
Forged upper receiver with forward assist and dust cover installed
Low-profile .750 steel gas block and stainless steel gas tube
Mil-Spec A2 flash hider reduces muzzle flash
Available in Black, Flat Dark Earth, and OD Green

Specifications

Brand: AT3 Tactical
Model: Assembled Forged Upper for AR-15 – 5.56 NATO – 16″ Barrel – 9″ Free Float Quadrail – No BCG/CH
MPN: FFQR-FOR-R-16-9
Caliber: 5.56 NATO
Barrel Length: 16 inches
Barrel Profile: M4
Barrel Material: 4150 CMV steel
Barrel Finish: Nitride
Barrel Twist: 1:7
Gas System: Carbine-length
Handguard Length: 9 inches
Handguard Type: Free-float quad rail
Handguard Material: 6061-T6 Aluminum
Handguard Weight: 12 ounces
Inside Diameter: 1.35 inches
Upper Receiver: Forged with forward assist and dust cover
Gas Block: .750 low-profile steel
Muzzle Device: A2 Mil-Spec flash hider (1/2×28 thread)
Color Options:
- Black
- Flat Dark Earth – H-267 Cerakote Magpul® Flat Dark Earth
- OD Green – H-232 Cerakote Magpul® OD Green

What’s Included – Installed

1x Assembled Upper Receiver
1x 9″ AT3 Pro Quad Rail Handguard
1x 16″ Rosco Bloodline M4 Profile Barrel
1x A2 Mil-Spec Flash Hider
1x 1/2″ Crush Washer
1x Carbine-Length Gas Tube
1x Low-Profile Gas Block
1x Forward Assist
1x Dust Cover

Products available on this page:

The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

All AT3 Tactical Brand Products carry a lifetime warranty against manufacturer’s defects.

This includes AT3 Red Dot Sights, Handguards, Iron Sights, and any other product that carries the “AT3 Tactical” or “AT3™” name. For other brands (ex. Magpul or Troy), please refer to the manufacturer’s warranty policy.

In the event that your AT3™ product becomes unusable, we will repair or replace the product at no charge to you.

If we cannot repair your product, we will replace it with a product in perfect working order of equal or better physical condition. The warranty is fully transferable, but we may require information about the original purchase to validate the authenticity of the product.

If your product is in need of warranty service, please contact AT3 Tactical to start the process

Our contact info is available here. To expedite processing, please provide your order information and description of the defect.

Please note: The AT3 Lifetime Warranty does not cover loss, theft, intentional damage or cosmetic damage that doesn’t affect the performance of the product.

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