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AT3 Tactical Lower Build Kit – Choose Your Own Stock, Grip, and Trigger
This lower build kit includes high quality components to start your next build – and none of the stuff you’ll want to upgrade anyway. This kit includes our Pro-Builder lower parts kit, as well as our Mil-Spec Buffer Tube Kit, providing a solid foundation for your next AR lower. This kit doesn’t include a grip, trigger, or stock – we figure you know what you want better than we do.
If you’re tired of paying for parts you’re just going to throw away before you complete your lower, this is the kit for you. Get what you want out of your next build, without the stuff that’s just going to collect dust in your garage.
Included Components
AT3™ Mil Spec Buffer Tube Kit
6 position Mil-Spec buffer tube
3oz carbine recoil buffer with T6 anodized aluminum body
Steel Buffer Spring
Steel castle nut
Steel end plate
AT3™ Pro-Builder™ Lower Parts Kit
Bolt catch
Bolt catch plunger
Bolt catch roll pin
Bolt catch spring
Buffer retainer
Buffer retainer spring
Magazine catch
Magazine catch button
Magazine catch spring
Pivot pin
Pivot pin detent
Pivot pin detent spring
Selector
Selector detent
Selector detent spring
Takedown pin
Takedown pin detent
Takedown pin detent spring
Pistol grip screw and lock washer
Detailed parts diagram included for quick and easy part identification
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.
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