AT3™ FF-ML Complete Rifle AR 15 Upper – .223/5.56 16″ Faxon Firearms Barrel – M-LOK Free Float Handguard
Uncompromising quality meets unbeatable value. The AT3 Tactical FF-ML Complete AR-15 Upper, now with a lightweight Faxon Gunner barrel!
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 money by bundling, and save time by letting us do the assembly!
This fully assembled AR-15 complete upper includes:
16″ Faxon Firearms 1:8 4150 CMV Midlength Gunner Barrel (with AT3 low profile gas block & midlength gas tube)
The Faxon Firearms barrel we use for this assembly has a 1 in 8 twist rate, perfect for stabilizing just about any 5.56 load you can feed it. The lightweight Gunner profile offers far better handling than front-heavy “Government” profile barrels, and the Midlength gas system produces less felt recoil.
Lightweight and tough, this unique M-LOK handguard is the best rail we offer. This rock-solid 6061 aircraft aluminum handguard that withstands the harshest treatment. 5-slot M-LOK-to-Picatinny rail section included
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.
Your choice of muzzle device(choose type with dropdown menu)
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.
Quality 7075-T6 charging handles – choose between standard latch and extended latch designs.
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: 16″
- Total Assembly Length: 24.5″
- Gas System: Midlength
- Barrel Profile: Gunner profile
- 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
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. This upper is assembled with a lightweight Faxon Firearms barrel for excellent performance and handling.
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.
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.
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.
AT3 shipped the upper the next day. The build quality of the upper is amazing, especially for the money! The OD green finish is a near-perfect match to a Magpul ODG. Lightweight and feature-rich, this is a 5 out of 5 for sure.
Thanks for sharing your feedback! We're glad you're satisfied with your purchase.
I purchased a complete upper for my first build. Although I have not completed my build yet, I carefully inspected the upper, m-lock handguard and barrel. The fit, finish, and feel are excellent. Shipped right away too. Awesome sales price as well. Will definitely be ordering from AT3 Tactical again.
Thanks for sharing your feedback, Ben. We're glad you're satisfied with your purchase. Cheers!
Bought an upper for my first (lower) build. These guys were more than helpful and took great care of me.
The simple fact that I’m taking the time to write a review should say it all.
Thanks for sharing your feedback, Al. We're glad you're satisfied with your purchase. Cheers!
Nicest upper I have handled
Thanks for sharing your feedback, DC. We're glad you're satisfied with your purchase. Cheers!
I got this complete upper during the Labor Day sale. I also had them switching the gas block with an Odin that I had which I sent them. I made another change and added a Lantec Dragon. The customer service was amazing, and communication was spot on. They even discounted the Lantec Dragon against the gas block and A2 flash hider that came off the upper. Shipping was unbelievable! 2 day shipping was included, I had the upper faster than I could get tracking number. The upper for the price is everything I could ask for and much much more! Thanks AT3 Tactical.
We are glad to hear that you are pleased with your complete upper and the customer service you received.