Retaining Pin / Cotter Pin - for AR15 / M16 Bolt Carrier

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$1.99 - $14.00

Originally the AR15 / M16 used a machined Retaining Pin to hold the firing pin in the Bolt Carrier. Eventually someone figured out this part was probably way over-engineered and just used a simple Cotter Pin instead... hence the Cotter Pin we still use today.

In the Pull Down Menu above you can choose which you need.

Note: Some shooters see the Retaining Pin as a "Performance Upgrade" since it is certainly much stronger vs the Cotter Pin.


Stainless Steel

Reproduction part

Made in USA

  • 5
    Machined Pin

    Posted by Skip Kniley 173d ABN BDE {sep} on 12th Jan 2021

    This is the real deal. So glad to have found it. No cotter pins for me if I can find this version, the original.