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

In Stock

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.

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 upgraded triggers like the 1005 Tactical 2-Stage Trigger. The kit contains quality, mil-spec parts and includes the selector as well as hammer and trigger pins for installing the fire control group of your choice.

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
    • Trigger Pin
    • Hammer Pin
    • Trigger guard roll pin
    • Pistol grip screw and lock washer
    • Detailed parts diagram included for quick and easy part identification

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    Customer Reviews

    Based on 19 reviews
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    B
    B.D.
    Superior

    These lower parts are exceptional, look great and easy to install, highly recommend.

    Thanks for sharing your feedback, Bruce. We're glad you're satisfied with your purchase. Cheers!
    D
    D.W.
    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!
    J
    J.Q.
    Ar 15 Build

    Have yet to build, waiting on lower and barrel from other suppliers. However everything was received in a timely manner and for the price i dont think i can go wrong. Thanks AT3.

    Thanks for sharing your experience, James. We work hard to meet expectations like yours, we're glad we hit the mark for you. Cheers!
    T
    T.P.
    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!
    T
    T.K.
    Great

    Parts were top quality

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