AT3™ Assembled Forged Upper for AR-15 – 16″ 5.56 NATO Barrel with 15″ Free Float Quad Rail
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. 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 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.
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
- 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 – 15″ Free Float Quadrail – No BCG/CH
- MPN: FFQR-FOR-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: 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 15″ AT3 Pro Quad Rail Handguard
- 1x 16″ 5.56 NATO Government Profile Barrel
- 1x A2 Mil-Spec Flash Hider & Crush Washer
- 1x Mid-Length Gas Tube
- 1x Low-Profile Gas Block
- 1x Forward Assist & Dust Cover
Products available on this page:
- AT3™ Assembled Forged Upper for AR-15 - 5.56 NATO - 16" Barrel - 15" Free Float Quadrail - No BCG/CH - 3 Colors - Black - Color: Black | SKU: FFQR-FOR-R-16-15-BLK
- AT3™ Assembled Forged Upper for AR-15 - 5.56 NATO - 16" Barrel - 15" Free Float Quadrail - No BCG/CH - 3 Colors - Flat Dark Earth - Color: Flat Dark Earth | SKU: FFQR-FOR-R-16-15-FDE
- AT3™ Assembled Forged Upper for AR-15 - 5.56 NATO - 16" Barrel - 15" Free Float Quadrail - No BCG/CH - 3 Colors - OD Green - Color: OD Green | SKU: FFQR-FOR-R-16-15-ODG
