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

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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 1005 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.

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


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.

AT3 Lifetime Warranty Logo

All AT3 Tactical Brand Products carry a lifetime warranty against manufacturer’s defects.

This includes AT3 Red Dot SightsHandguardsIron 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.

Customer Reviews

Based on 53 reviews
96%
(51)
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D
Douglas Wilson
Lower parts

Excellent product, fast shipping.

Thanks for sharing your experience, Douglas. We work hard to meet expectations like yours, we're glad we hit the mark for you. Cheers!

T
Timothy Partington
Fit And function

Parts seem to be no different than any other parts kit I've ever ordered. Everything fit well worked well and the price was right.
Plus It's U.S.A made!

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

w
william massey
fantastic

fantastic went in ati polymer lower fit perfect

Looking good! Thanks for choosing AT3, William. We work hard to meet expectations like yours, we're glad we hit the mark for you. Cheers! - AB

R
RMarsh
Pro-builder LPK

Perfect priced kit for your build when you have an AT3 inhanced (nickel teflon)FCG and Hogue grip picked out. Plus you have the first class, personable, professional AT3 customer support if you have any issues. Oh yea, made in USA by Americans!!
Thanks again AT3 team!!

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

M
Matt
Works great

Great parts kit, just what I needed without the extra stuff I already have. AT3 is top notch. First place I go to for firearms related stuff.

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