AT3™ FF-ML 10.5″ Complete AR 15 Pistol Upper – Choose Your Own 10.5 inch .223/5.56 Barrel – 12″ 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


The AT3 10.5″ Pistol Upper with SPEAR M-LOK Handguard – 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 or Anderson Manufacturing Barrels plus 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 vs purchasing the components separately.

This fully assembled AR-15 complete upper includes:

  • Your Choice of 10.5″ Barrel from Anderson Manufacturing or Faxon Firearms! (with low profile gas block & carbine gas tube)
  • AT3 SPEAR 12″ Free Float M-LOK handguard
  • AT3 Tactical Billet Upper Receiver
  • KAK Industry Flash Can

Get your new upper complete with the barrel you want!

The 10.5″ Anderson Manufacturing barrel is highly affordable, featuring a rugged nitride finish. Faxon Firearms’ 10.5″ barrel is geared towards high performance, featuring great accuracy with a variety of 5.56 bullet weights, and a corrosion-resistant QPQ finish. You can learn more about these two great products with the links below.

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 standard flash can is only 3.5 inches in length and fits perfectly under the SPEAR handguard.

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 info:

  • 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: 10.5″
  • Total Assembly Length: 20″
  • Gas System: Carbine
  • Barrel Profile: Government profile
  • Twist Rate:
    • Anderson: 1:7
    • Faxon: 1:8
  • Barrel Steel: 4150 Chrome Moly Vanadium
  • Barrel Finish:
    • Anderson: Parkerized
    • Faxon: QPQ Corrosion Resistant (Black Nitride)
  • Chamber: 5.56 NATO
  • Muzzle Thread: 1/2-28
  • Barrel Extension: M4
  • Diameter at Gas Block: .750″
  • 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
    • Pink: H-224 SIG™ Pink
    • Red: H-167 USMC Red
    • 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

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 23 reviews
Matthew antonicello

Great product fast shipping

Thank you for sharing your feedback! We're glad you are satisfied with your purchase!

Lawrence Martin
1 bada$$

The look love it. range proven quality not one complaint.

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

David Armendariz
Great experience

Was east to order all the parts and got it to my FFL in couple days

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

Ryan Rungruang
Great quality at an affordable price

Beyond stunned with the quality of this upper. Looks great and functions like a champ. Made in America !!!!

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

Casey Wheeler
Very satisfied with this upper

Upper arrived in excellent condition. Packaging was great and shipping was fast. The fit and finish of the upper receiver, handguard, and all other components are fantastic. The handguard does not have any rough edges or burs and feels great in the hand. I also purchased the AT3 lower parts kit and used most of the contents on the Fortis lower paired with this upper. Those parts were nice quality as well. This upper meshed nicely with the Fortis billet lower resulting in no play between the two. Despite the poor quality picture I attached, I think they look great together. Have only fired 60 rounds thus far but had no issues and the accuracy of the Faxon barrel did not disappoint. I couldn’t be more pleased with my purchase or the service provided by AT3. I contacted this company by phone as well as e-mail and my inquiries were addressed immediately on both occasions. Top notch service and product quality. Truly a great purchase experience. Also, this is the first time I’ve ever left a review of any purchase or product - the experience with AT3 was so positive that I felt obligated to take the time to express my satisfaction.

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