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

1 review

You will receive fast, free shipping for all orders over $35

Shipping cost is $5.50 for orders under $35. We ship with UPS and USPS. 

Most orders ship out within 24 hours

You will receive tracking information immediately at the time of shipment. To expedite shipping, we may ship your order from multiple warehouses.  

We have a 90-day no-hassle return policy. We pay return shipping.

If you need to request a return, contact us at and we will send you a return label

After 90 days, defective items will still be covered under the manufacturer’s warranty, where applicable.

Please refer to the product listing for warranty details. If you have specific warranty questions, contact us at We may direct you to pursue your warranty claim directly with the manufacturer.

Your satisfaction is our #1 priority

If you're dissatisfied with your purchase, in any way, please contact us at - we will do our best to make it right.

Product Options


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 a Geissele. The kit contains quality, mil-spec parts and includes the selector as well as an enhanced trigger guard that provides extra room in the trigger area.

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 a lifetime warranty 

Easy to Install

  • Parts are organized in color coded bags
  • Detailed parts diagram included for quick and easy part identification

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
  • Enhanced trigger guard
  • Trigger guard roll pin

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