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AT3™ Mil-Spec Plus Lower Parts Kit w/ Ambi Selector and X-Tech Grip

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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.

A mil-spec lower parts kit with several key upgrades – perfect for your next AR build

The kit contains quality, mil-spec parts to build out your lower receiver, including a X-tech Adjustable grip, an Ambidextrous selector, and 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 the AT3 Lifetime Warranty

    This Kit Includes:

    • Bolt catch
    • Bolt catch plunger
    • Bolt catch roll pin
    • Bolt catch spring
    • Buffer retainer
    • Buffer retainer spring
    • Disconnector
    • Disconnector spring
    • Hammer
    • Hammer pin
    • Hammer spring
    • Magazine catch
    • Magazine catch button
    • Magazine catch spring
    • Pistol grip lock washer
    • Pistol grip screw
    • Pivot pin
    • Pivot pin detent
    • Pivot pin detent spring
    • Ambidextrous Selector
    • Selector detent
    • Selector detent spring
    • Takedown pin
    • Takedown pin detent
    • Takedown pin detent spring
    • Trigger
    • Enhanced trigger guard
    • Trigger guard roll pin
    • Trigger pin
    • Trigger spring
    • X-Tech Grip

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