AT3™ FF-ML 11.5 Inch Complete AR 15 Pistol Upper – .223/5.56 11.5 Inch Faxon Firearms Barrel – 12 Inch M-LOK Free Float Handguard

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AT3™ AR-15 Bolt Carrier Group -  5.56 NATO/.300 Blackout - Black Nitride

AT3™ AR-15 Bolt Carrier Group - 5.56 NATO/.300 Blackout - Black Nitride


AT3 Tactical Standard GI Charging Handle - Black


AT3 11.5″ Pistol Upper with Faxon Firearms Midlength Barrel – Made to Order and Ships in 7 Days

AT3 Complete Upper assemblies are Built for Accuracy and Reliability – Guaranteed.

  • Quality Where it Counts – premium components like Faxon Firearms barrels, and AT3 Tactical’s handguards and uppers. Don’t settle for “bargain uppers” with unknown components.
  • Guaranteed Reliability– Carefully assembled before shipment, and backed by the AT3 Lifetime Warranty
  • Unbeatable Value – Unbeatable quality in the price range. Save up to 20% off vs purchasing the components separately.

This fully assembled AR-15 complete upper includes:

  • 11.5″ Faxon Firearms 1:8 4150 CMV GUNNER Barrel
  • Wojtek Weaponry Adjustable Gas Block
  • AT3 SPEAR 12″ Free Float M-LOK handguard
  • AT3 Tactical Billet Upper Receiver
  • KAK Industry Flash Can

Read full details below:

11.5″ Faxon Firearms 1:8 4150 CMV GUNNER Barrel

Faxon Firearms makes some of the finest lightweight barrels in the industry, and this unique barrel is no exception. It features a midlength gas system, keeping recoil soft while retaining a compact 11.5″ length. The 1:8 twist ensures accuracy across a wide variety of cartridges, and QPQ finish offers superior corrosion resistance.

Wojtek Weaponry Adjustable Gas Block

The critical component for the best possible feeding and accuracy on your new upper. Wojtek Weaponry’s adjustable gas blocks are easy to adjust to your favorite factory cartridge or handload, and use a clamp-on design to impart better accuracy better than pinned or set-screw gas blocks.

AT3 SPEAR 12″ Free Float M-LOK handguard

Unique slim and lightweight design with M-LOK attachment points. Rock-solid 6061 aircraft aluminum handguard that withstands the harshest treatment. 5-slot M-LOK-to-Picatinny rail section included

AT3 Tactical SPEAR M-LOK Free Float Handguard

AT3 Tactical Billet Upper Receiver

Precision machined from 6061-T6 aluminum, this assembled upper is sleek, with extra material around the barrel extension for superior accuracy. It mates perfectly with our SPEAR handguard and features M4 feed ramps for reliable feeding of ammunition.

AT3 Tactical Billet Upper for AR15

KAK Industry Flash Can

One of the most popular muzzle devices for AR15 pistols. The conical shape directs muzzle blast and noise directly in front of the shooter, reducing concussion for the shooter. The Micro flash can is only 1.75 inches in length and fits perfectly under the SPEAR handguard.

KAK Industry Micro Flash Can, 1/2-28 Thread

Top Add-Ons

AT3 Black Nitride Bolt Carrier Group

Finish your complete upper with a reliable, easy to clean Black Nitride Bolt carrier group from AT3. They feature M16 carriers, and MPI inspected bolts made from 9310 steel and properly staked grade 8 gas key screws.

Your choice of Standard GI or Extended-Latch Charging Handles from AT3


These 7075-T6 charging handles slide right into our uppers for a complete top end. Choose between a standard latch and extended latch designs to fit your needs and budget.

More Information:

  • This product is built-to-order in our Minnesota facility. Quality takes time – please allow up to 7 days for your order to ship.
  • All AT3 upper assemblies come with a Lifetime Warranty – if you ever have an issue, let us know, and we’ll make it right. It’s that simple.
  • Don’t see the options you’re looking for? Let us quote you a custom upper – contact us now.


  • Barrel Length: 11.5″
  • Total Assembly Length: 20″
  • Gas System: Midlength
  • Barrel Profile: GUNNER (Lightweight)
  • Twist Rate: 1:8
  • Barrel Steel: 4150 Chrome Moly Vanadium
  • Barrel Finish: QPQ Corrosion Resistant (Nitride)
  • Chamber: 5.56 NATO
  • Muzzle Thread: 1/2-28
  • Barrel Extension: M4
  • Diameter at Gas Block: .625″
  • Gas Block Type: Low-profile
  • Receiver Material: Billet 6061-T6 Aluminum
  • Finish
    • Black: Hardcoat Anodized
    • Flat Dark Earth: H-267 Magpul® Flat Dark Earth
    • OD Green: H-232 Magpul® OD Green
    • Gray: H-188 Magpul® Stealth Grey
    • Red: H-167 USMC Red
    • Pink: H-224 SIG™ Pink
    • Burnt Bronze: H-148 Burnt Bronze
    • Tungsten: H-237 Tungsten
    • Titanium: H-170 Titanium

3 reasons why AT3 Complete Uppers are better than the rest.

1 – Quality Where it Counts

The single most important component of an accurate AR-15 is the barrel. AT3 uppers are built using barrels from top brands like Ballistic Advantage and Faxon Firearms, for excellent performance and accuracy.

But the quality doesn’t stop at the barrel. Our AT3 handguard and upper work together to provide superior accuracy, meaning this upper assembly offers quality without compromises.

Many of the “bargain” complete uppers on the market source their parts from the lowest bidder – at the expense of accuracy and reliable function. AT3 is committed to using only top-quality components in our upper assemblies.

2 – Guaranteed Reliability

AT3 complete uppers are assembled with strict quality controls and carefully packaged for delivery to the customer. All AT3 complete uppers offer a Lifetime Warranty – if you ever have an issue, let us know, and we’ll make it right. It’s that simple.

3 – Unbeatable Value

When you buy a complete upper, you’ll save money and parts and assembly vs purchasing the components separately. Our complete uppers are not the cheapest on the market, but they deliver unbeatable quality in the price range. We sell direct to the customer, and cut out the middle-men, to deliver the best value in AR-15 upper assemblies.

Products available on this page:

Have Questions About this Product?

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 Lifetime Warranty Logo

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

This includes AT3 Red Dot SightsHandguardsIron 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.

Customer Reviews

Based on 8 reviews
Michael S.
Great Billet Upper with Mid-Length Gas 11.5 Faxon Barrel

Looks nice and you can see it is Billet as the lines are real crisp. The rail and upper runs together and it looks a little like a monolithic upper in person. I got it Tuesday shot it Wednesday as the weather was nice - I tried turning the gas down some and ended up turning it back up to where it came from the factory - It is adjusted about perfect - It likes .223 55 grain fine but works best with M193 55 grain 5.56 - It did not like .223 77 grain and I had to cycle it with Charging Handle - It might be low power and made for 16" or longer barrels - Barrel Seems accurate although it was just a shakedown run - Always ejected good - It got smoother after shooting it some - It has NO Forward Assist or large normal size brass deflector - It is more streamlined and that is fine with me - Forward Assists really almost never helps a problem, just makes it worse - Definitely want more AT3 Tactical and Faxon stuff - Recommended!

Thanks for sharing your feedback! We're glad you're satisfied with your purchase.

Thomas Mixon
Awesome looking upper!

I received my product very quickly and was very satisfied with what I received. It looks amazing on my lower! I haven't been able to shoot it yet since I am still waiting on my BCG from a different company. but I am positive my rifle is going to function flawlessly. The quality of this upper assembly is amazing and I love how low profile the fore end is!

Thanks for sharing your feedback, Thomas. We're glad you're satisfied with your purchase. Cheers!

Michael Woodard
Great company

This is my second purchase from AT3. Everything has been expectational! Will buy again

Thanks for sharing your feedback! We're glad you're satisfied with your purchase.

Kendal Mclean

It’s good ya

Thanks for sharing your feedback! We're glad you're satisfied with your purchase. Cheers!

Ed N

Just shot this upper for the first time yesterday and it shot great and is extremely lightweight! will be buying more! the faxon Barrel is Top tier quality too!

Thanks for sharing your feedback, Ed. We're glad you're satisfied with your purchase. Cheers!