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AT3™ FF-ML 11.5" Complete Pistol Upper - .223/5.56 11.5" Ballistic Advantage Barrel - 12" M-LOK Free Float Handguard

AT3™ FF-ML 11.5″ Complete Pistol Upper – .223/5.56 11.5″ Ballistic Advantage Barrel – 12″ M-LOK Free Float Handguard


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Lifetime WarrantyOn All AT3 Brand Products

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.

Fast & Free Shipping On orders over $50

You will receive fast, free shipping for all orders over $50

Shipping cost is $7.99 for orders under $50. We ship with UPS or USPS, depending on the item.

Most orders received by 1pm CST ship the same day

You will receive an email with tracking information at the time of shipment. To expedite shipping, we may ship your order from multiple warehouses. Orders placed on weekends, holidays, or after 1pm will ship the following business day.

Uncompromising quality meets unbeatable value – The AT3 11.5″ Pistol Upper with SPEAR M-LOK Handguard

Our AT3 FFML Pistol Upper, complete on an AR15 Pistol Lower with SB Tactical SBM4 Brace

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

  • Quality Where it Counts – premium components like Ballistic Advantage 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″ Ballistic Advantage 1:7 4150 CMV M4 Nitride Barrel (with low profile gas block & carbine gas tube)

Ballistic Advantage Modern Series barrels feature precision-machined 4150 CMV steel, durable QPQ (Nitride) coating, and a Sub-MOA accuracy guarantee.

AT3 SPEAR 12″ Free Float M-LOK handguard

AT3 Tactical SPEAR M-LOK Free Float 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 Billet Upper Receiver

AT3 Tactical Billet Upper for AR15

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 feature M4 feedramps for reliable feeding of ammunition.

KAK Industry Flash Can

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

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.

Optional Upgrades (use the dropdown menu to select):

AT3 Black Nitride Bolt Carrier Group

(Only $94 – save $6 vs regular price)

AT3 Tactical provides Top-Tier Bolt Carrier Groups with all the uppers we sell. They feature M16-style carriers, MPI inspected bolts made from 9310 steel, and properly staked grade 8 gas key screws.

Your choice of Standard GI or Extended-Latch Charging Handle

(Discounted Pricing – Save $4 vs regular price)

Quality 7075-T6 charging handles – choose between standard latch and extended latch designs.

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: 11.5″
  • Total Assembly Length: 20″
  • Gas System: Carbine
  • Barrel Profile: Government profile
  • Twist Rate: 1:7
  • 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: .750″
  • Gas Block Type: Low-profile
  • Receiver Material: Billet 6061 T6

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 Ballistic Advantage barrels with a Sub-MOA Accuracy Guarantee.

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.

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Customer Reviews

Based on 12 reviews
Quality product, great value

Good quality upper, looks good and runs flawlessly. Love the notch that really locks in the handguard. With the Ballistics Advantage barrel included, this is a solid package, especially for the price. Nothing but good things to say about it. Buy with confidence!

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

After tussling and wrestling with the question of whether i should buy it for about 2 weeks.. I’m very satisfied with my purchase. Though I need to find time to shoot it. Thanks AT3 Tactical and Ballistics Advantage

Thanks for sharing your feedback, Ed. We're glad you're satisfied with your purchase. Cheers!
Good looking product have not shot yet

From the start shipping was faster then promised and free! I am a first time buyer and so I got the promotional discount but I was 3 cents off meeting the 500 dollar mark. I didn’t even have to contact anyone and they just gave it to me, that is customer service! Overall product looks to be made very well and is nice and lightweight! Paired great with my Aero lower.

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

I ordered my upper the end of last week and it arrived about an hour ago. Very pleased with its looks and it’s snug fit to my lower. I plan on sighting in my flip up sights and red dot(competitor’s model) this weekend.


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

I first bought the Faxon version of this upper but had poor accuracy, contacted AT3 about it and they sent me this upper to try instead, I also had the Faxon upper yet so I side by side tested them , the ballistic advantage was shooting 1 inch groups at 100 yards with 75grain bthp frontier ammo!! Sent the faxon back and am an AT3 customer for life!!

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