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

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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 12 reviews
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    j
    j.m.
    pro trigger kit

    the parts were of good fit&finish,have not installed yet.

    Thanks for sharing your feedback, James. We're glad you're satisfied with your purchase. - AB
    w
    w.m.
    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
    G
    G.B.
    Nice lil parts kit

    This lower parts kit worked very well for me as I choose a different stock and trigger. I didn't want to waste money on parts I didn't need. The kit comes with brief instructions and AT3 had the parts sorted in such a manner to make it all easily identified for proper placement.

    We really appreciate you taking the time out to share your experience with us. We work hard to meet expectations like yours, and we’re happy to hear we hit the mark for you. Cheers! - AB
    P
    P.H.
    Perfect

    It was exactly what I was looking for. Everything fits perfect. Every part is high quality, I highly recommend.

    We try our best to provide products that are cheap in price, but not in quality. Thank you for the feedback, Paul! -- LM
    V
    V.H.
    Quality & value

    Everything fit, everything works. Excellent price.

    We really do our best to deliver not only quality products, but quality experience as well. Thank you for your feedback, Vernon! -- AB