AT3™ Mil-Spec AR-15 Firing Pin

SKU: AT3-Firing-Pin-556

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AT3 Hard Chrome Firing Pin

The AT3™ Mil-Spec AR-15 Firing Pin is a premium replacement component for your AR-15. This component is guaranteed to fit and function in your AR and is perfect for replacing lost or damaged parts.

It’s made heat treated 8640 steel and hard chromed to prevent breakage, increase the component’s longevity, and make it easier to clean. All AT3 Tactical upper receiver parts meet or exceed Mil-Spec.


  • Fits all standard AR15 sized bolts
  • Precision machined from heat treated 8640 steel
  • Hard Chrome Plated
  • Manufactured to Mil-Spec dimensions
  • 100% American Made

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 9 reviews

Replaced my stock firing pin after a trip to the range proved my firing pin tip had broken. I wanted to test a new load with my .223 55gr hand load. Pulled the trigger is all I heard was a click. I then tried a mag of “factory” .223 and had the same result. Bought a few of these firing pins and now my rifle no long just goes click. Now click bang.

Thank you for the review and for taking the time to write it. We're glad to hear that this firing pin works perfectly and solves a common issue - having a rifle that just goes click instead of bang.

Norman. Oliver

Everything's great works good AT3 tactical is great

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

Robert Coble

It is working fine with no problems

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

kevin hiatt
Great parts

Fast service good parts good verity of parts and first quality

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

Charles Lobrie
Firing pin

As of right now I don’t have much to as I have not had a chance to install it. But I did read the spec, before I ordered it so if it performs as described along with the new trigger I wi be a happy camper. As it stands I have never purchased any item from AT3 that has not performed above description, I look forward ward to our next review by then you will know what I know.

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