AT3™ Assembled Upper for AR-15 - 5.56 NATO - 16" Barrel - 15" Free Float Quadrail - No BCG/CH

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

This assembled upper delivers a full-length, reliable platform for AR-15 builds with the proven reliability of quad rail accessory mounting. This is the foundation for shooters building a versatile home defense rifle, duty gun, or all-purpose range blaster where you need the full velocity and reliability of 5.56 NATO. The 15-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—with maximum real estate for multiple accessories, pressure switches, and extended bipod placement.

The 16-inch government profile barrel in 5.56 NATO pairs with a mid-length gas system for smooth, reliable cycling and reduced recoil compared to carbine-length systems. The 15-inch Pro Quad Rail provides secure accessory mounting on all four sides, extending nearly to the muzzle for a sleek, modern profile. The quad rail is lightened down all four sides for weight reduction while remaining solid enough to handle heavy use. Five integrated QD sockets give you multiple sling mounting options for any configuration.

Built on AT3’s slick side billet upper receiver with a low-profile .750 steel gas block and stainless gas tube, this setup is ready to run once you add your choice of bolt carrier group and charging handle. The Mil-Spec A2 flash hider effectively reduces muzzle flash and gives the muzzle a clean, finished look.

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

Features

16-inch government profile barrel with mid-length gas system for smooth cycling
15-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
Slick side billet upper receiver for clean lines
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 Upper for AR-15 – 5.56 NATO – 16″ Barrel – 15″ Free Float Quadrail – No BCG/CH
MPN: FFQR-R-16-15
Caliber: 5.56 NATO
Barrel Length: 16 inches
Barrel Profile: Government
Gas System: Mid-length
Handguard Length: 15 inches
Handguard Type: Free-float quad rail
Handguard Material: 6061-T6 Aluminum
Handguard Weight: 1 pound 2 ounces
Inside Diameter: 1.35 inches
Upper Receiver: Slick side billet
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

All 3 options on this page

AT3™ Assembled Upper for AR-15 - 5.56 NATO - 16" Barrel - 15" Free Float Quadrail - No BCG/CH - 3 Colors - Color: Black | SKU: FFQR-R-16-15-BLK
AT3™ Assembled Upper for AR-15 - 5.56 NATO - 16" Barrel - 15" Free Float Quadrail - No BCG/CH - 3 Colors - Color: Flat Dark Earth | SKU: FFQR-R-16-15-FDE
AT3™ Assembled Upper for AR-15 - 5.56 NATO - 16" Barrel - 15" Free Float Quadrail - No BCG/CH - 3 Colors - Color: OD Green | SKU: FFQR-R-16-15-ODG

Very well done, upper. Flawless. It has already gone through 2k rounds, and the barrel and rail are still the same, no changes.
I will recommend this upper to everyone.

it works great

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Backed by the AT3 Lifetime Warranty!

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.

90-day no-hassle returns

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.

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