AT3™ Pro-Builder™ AR-15 Lower Parts Kit – No Grip or Trigger Assembly

Based on 125 reviews

Orders will Ship within 1 Business Day

Backed by the AT3 Lifetime Warranty!

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Perfect Lower Parts Kit for the Premium Builds

This quality lower parts kit excludes the two most commonly upgraded components – the grip and the trigger assembly (fire control group).

This is the perfect kit for premium builds that include premium triggers like the AT3 Tactical 2-Stage Trigger. The kit contains quality, mil-spec parts and provides you with the flexibility to spend money on the parts you want – and none of the extras that will sit in your toolbox.

New Color Options!

We’ve added the option to get a Pro-Builder kit with all the parts you’ll see outside your gun in matching Cerakote! We’ve included a handy guide so you can make sure you’re getting the right color for your build. Naturally, these match with all of AT3’s other Cerakote AR parts.

Cerakote Finishes

Flat Dark Earth: H-267 Magpul® Flat Dark Earth
OD Green: H-232 Magpul® OD Green
Pink: H-224 SIG™ Pink
Red: H-167 USMC Red
Blue: H-171 NRA Blue
Burnt Bronze: H-148 Burnt Bronze
Tungsten: H-237 Tungsten
Titanium: H-170 Titanium

American Made Quality

All parts meet or exceed military specifications (Mil Spec)
Components are 100% Made in the USA
Quality packaging keeps components protected and organized
Backed by the AT3 Lifetime Warranty

This Kit Includes:

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

Products available on this page:

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.

4.9 125 reviews