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AR-15 Hammer Pin

The United Defense AR-15 Hammer Pin is a mil-spec replacement pin built to factory .154" diameter for standard AR-15, M4, and M16 lower receivers. Machined from hardened steel and finished in corrosion-resistant black oxide, it drops straight into the hammer pin hole with no fitting required. Whether you're assembling a new lower, swapping in an aftermarket trigger group, or restocking your armorer's kit, this is the kind of small part you never want to be without. A smart spare for AR builders, gunsmiths, and anyone who runs their rifle hard.

In stock

SKU
8448609-1
  $2.25
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Description

Features

  1. Mil-Spec Dimensions — Manufactured to standard .154" diameter for a drop-in fit in mil-spec AR-15 and M16 lower receivers.
  2. Hardened Steel Construction — Heat-treated steel resists shearing, peening, and wear under repeated hammer cycling.
  3. Black Oxide Finish — Corrosion-resistant black finish matches factory fire control components and protects against moisture.
  4. Precision Machined — Tight diametric tolerances keep the hammer properly indexed and eliminate slop between the pin and receiver walls.
  5. Direct Replacement Part — Drops straight into the hammer pin hole with no fitting, modification, or special tools required.
  6. Broad Compatibility — Fits AR-15, M4, M16, and most aftermarket mil-spec lowers chambered in 5.56 NATO, .223 Rem, .300 BLK, and other common AR cartridges.
  7. Smooth Bearing Surface — Polished pin shaft minimizes friction against the hammer body for consistent lock time and reset.
  8. Essential Spare — Worthwhile addition to any AR builder's parts bin, armorer's kit, or range bag for fast field repairs.

More Information

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Customer Reviews

4.4

86 reviews

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Top customer reviews

  1. Jesus C.

    Great Website

    Overall Rating

    Cheapest price anywhere that was online. Shipping was fast from Fedex.

  2. Elzie V.

    Great AR15 hammer pin

    Overall Rating

    Delighted with this transaction.

  3. Albin L.

    Superb AR15 hammer pin

    Overall Rating

    A++

  4. Jamille D.

    Great for my use

    Overall Rating

    A++

  5. Harris T.

    Good Company

    Overall Rating

    Received in two days after placing my order. Will be back to buy at KS again!
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