AT3 Tactical Firing Pin Retainer for AR15 BCG


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AT3™ MOTHERFU-BAG™ AR-15 Lost and Extra Parts Kit - Springs, Detents, Replacement Components


Replacement Cotter Pin for AR-15 Firing Pin

From the first time you’ve stripped down your AR15, you’ve probably learned to hate the firing pin retainer.  It can be hard to get out, even harder to get back in, it’s easy to lose and can be easy to break.  If you’re in need of a replacement, and your firing pin is free-floating, this replacement piece will serve you well.  This isn’t an off-the-shelf cotter pin from the hardware store; this is specifically made for the AR-15, and is compatible with any mil-spec bolt carrier group.


  • Fits standard AR-15/M-16 bolts
  • Not a standard cotter pin – made specifically for AR-15
  • Durable, corrosion-resistant phosphate finish
  • Mil-spec dimensions
  • Made in the USA

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 6 reviews
Johnny Whitlock

Gaps to wide did not fit any of my bcgs forced one in using needle nose & ball peen hammer !! Should have not had to use a hammer to force fprp into bcg !! I DID GET A REFUND FAST BUT WILL NEVER ORDER FPRP AGAIN !! I USE FAIL ZERO BCGS & NOT ONE FITTED AS SHOULD !!

So sorry to hear about the issue, Michael. We sent you an email to resolve the issue.

Jeremy Nelson
Great place to shop

They fit like a glove in my ar great product

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

Steve G
Top firearms parts company

It was easy to find what I wanted and order it. Parts have all worked very well. I like to keep extra of smaller parts incase myself or a friend need something now. Thank you

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

Michael Boozer

All the product support so far have been great.

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

Joseph Salcido
Quality parts!

Replaced my firing pin retainer and put about 300 rounds through my rifle. It held up strong and looks good.

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