AT3™ 2-Stage AR-15 Lower Parts Kit with 4.5lb Nickel Boron Trigger – No Grip or Trigger Guard

Based on 25 reviews

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Backed by the AT3 Lifetime Warranty!

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Experience the difference a 2-Stage Trigger makes in your next build.

Get more out of your rifle with a two-stage trigger and always-dependable Pro-Builder Lower Parts Kit. With a 4.5 lb total pull weight and a durable Nickel Boron finish, this trigger ensures a smooth pull and crisp break every time you squeeze the trigger.

The two stages of this trigger consist of an initial 2 lb pull that brings you to a “wall”, where the hammer and trigger are set to break for the shot. After that, it’s only a 2.5 lb pull to fire, helping you to make accurate shots with short resets in between.

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

Easy to Install

Quick and easy installation – can typically be done in 10 minutes using our detailed instructions. No special tools required.

Parts Included:

2-Stage Nickel Boron Trigger
2-Stage Nickel Boron Hammer
2-Stage Disconnector
Trigger spring
Trigger pin
Hammer pin
Hammer spring
Disconnector spring
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

About The 2-Stage Trigger

AT3 has these 4.5 lb 2-Stage triggers made by Schmid Tool Schmid Tool is best known as the premier manufacturer of mil-spec AR-15 fire control groups. From government contracts to the biggest rifle manufacturers – Schmid Tool triggers have been trusted in millions of weapons over their 60 years in business.

Our goal in this partnership is to bring our customers world-class engineering and manufacturing, with factory-direct pricing. For the finest quality triggers you can stake your life on, without the “big brand” price tag.

Products available on this page:

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.

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.

4.8 25 reviews