AT3™ 2-Stage AR-15 Lower Parts Kit with 4.5lb Nickel Boron Trigger - No Grip or Trigger Guard
or 4 interest-free payments of $27.62 with 
6 Magazines Per Order: Due to extreme volume, we are limiting sales of magazines to 6 per customer order. This applies to individual and bundled magazines. AT3 reserves the right to cancel any order over the 6 magazine limit.
- Free standard shipping on orders $139+ details
- 90-day no-hassle returns policy
- Backed by the AT3 Lifetime Warranty! what it covers
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Product description
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.
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Customer reviews 25
Verified buyerAT3 Tactical · Thanks for sharing your feedback! We're glad you're satisfied with your purchase.
AT3 Tactical · Thanks for sharing your feedback! We're glad you're satisfied with your purchase.
Thank you
AT3 Tactical · Hi Robert. It appears that the issue has been resolved, if you need further help, please don't hesitate to let us know.
The rest of the parts are just what I expected. Nothing fancy, but they function fine which is what I was looking for.
My main complaint is that the Trigger guard pin was missing from my kit. Several people have had this issue so it surprised me that they have not resolved this at the factory yet.
AT3 Tactical · Thanks for sharing your feedback, John. Your comments were noted. We'll continue working hard still, we're glad you're satisfied with your purchase. Cheers!
The pictures it shows 1005 tactical etched into the trigger and hammer. The trigger Group I got has no markings or stamps proving its a 1005 tactical. Over all it will do the job.
AT3 Tactical · Thanks for sharing your feedback, Nicholas. We're glad you're satisfied with your purchase. Cheers!
AT3 Tactical · Thanks for sharing your feedback, Michael. We're glad you're satisfied with your purchase. Cheers!
AT3 Tactical · Thanks for sharing your feedback, Aaron. We're glad you're satisfied with your purchase. Cheers!
Questions & Answers
No questions yet. Ask about fit, install or compatibility and our team answers within a business day.
Warranty & returns
Backed by the AT3 Lifetime Warranty!
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.
90-day no-hassle returns
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.
