We Ship Fast!
Order by 1PM CST for Same Day Shipping (Mon-Fri)
AT3™ Complete Rifle Kit – Magpul Lower Build Kit – .223/5.56 16 Inch Ballistic Advantage Barrel – M-LOK Free Float Handguard
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.
Instant Rifle. Just Add Lower.
Don’t settle for the budget-line rifle kits you’re used to seeing. Get a complete assembled upper from AT3 Tactical, with a lower build kit including a Magpul CTR Stock and Pistol Grip, plus our enhanced Nickel Teflon Trigger assembly. This is absolutely the best bang for your buck.
The AT3 Rifle Kit Includes:
- AT3 FFML 16″ M-LOK Complete Upper
- Lightweight Ballistic Advantage Barrel
- AT3 SPEAR M-LOK Handguard and Billet Upper
- AT3 Black Nitride Bolt Carrier Group
- Your Choice of Muzzle Device and Charging Handle
- AT3 Enhanced Nickel Teflon Trigger Group
- Magpul CTR Stock, MOE Pistol Grip, and Trigger Guard
- AT3 Buffer Tube Kit and Lower Parts Kit
Freedom of Choice
Your choice of standard Black, Magpul Flat Dark Earth, or Magpul Stealth Grey to have your receiver, handguard, and all furniture matching on your new build!
Your choice of 3 different muzzle devices (choose type with dropdown menu)
Your choice of Standard GI or Extended-Latch Charging Handle
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″
- Gas System: Midlength
- Barrel Profile: Pencil
- 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: .625″
- Gas Block Type: Low-profile
- Receiver Material: Billet 6061 T6 Aluminum
- Receiver Extension Material: 6061 T6 Aluminum