AT3™ Mil-Spec AR-15 Hammer Spring

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Mil-Spec AR-15 Hammer Spring

Looking for a durable and reliable Hammer Spring for your AR-15 trigger? Look no further than AT3 Tactical. Our Hammer Spring is designed to meet or exceed Mil-Spec requirements, ensuring that it will fit and function perfectly in your rifle.

All of our lower receiver parts are made in the USA, so you can trust that you’re getting a quality product that will last. Whether you’re replacing a lost or damaged part, or just want to upgrade your rifle, our bolt catch pin is the perfect choice.



  • Brand: AT3 Tactical
  • Model: Mil-Spec AR-15 Hammer Spring
  • MPN: AT3-HS-01
  • Fit: Mil-Spec AR-15 Trigger Assemblies
  • Material: Steel
  • Weight: 0.5 oz

Have Questions About this Product?

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.

AT3 Lifetime Warranty Logo

All AT3 Tactical Brand Products carry a lifetime warranty against manufacturer’s defects.

This includes AT3 Red Dot SightsHandguardsIron 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.

Customer Reviews

Based on 2 reviews
Shamar Matthews
Useful Piece

Just bought this to install it in the receiver of my AR-15 I'm building. It fits perfectly, I'm expected to buy more for future projects.

Thanks for the review!

Extra parts

Purchased to have on hand for extra parts. Hope not to need them, but nice to have just in case.

Thanks for sharing your feedback! We're glad you're satisfied with your purchase. Cheers!