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AR15 hammers

Discussion in 'Rifle Country' started by jblackfish, May 15, 2013.

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  1. jblackfish

    jblackfish Member

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    Can anyone explain to me why some hammers are notched and some are rounded? I have two complete lowers, one I built and one I bought and have one of each hammer. Why the difference and does one work for some uppers and not others, etc. I'd appreciate the explanation. See photos:
    [​IMG]
    [​IMG]
     
  2. HOOfan_1

    HOOfan_1 Member

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    Last edited: May 15, 2013
  3. jakk280rem

    jakk280rem Member

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    I believe the notched hammer was introduced by Colt for use with their semi-auto (unshrouded) carriers to prevent an out of battery firing condition.
     
  4. 68wj

    68wj Member

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    Stops "automatic" fire if the disconnector doesnt hold the hammer back. It snags the firing pin and stops the forward motion of the bolt carrier.
     
  5. Dr.Rob

    Dr.Rob Moderator Staff Member

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    Also notched hammers are bad (less reliable) for 9mm uppers.. or so I have read.
     
  6. briansmithwins

    briansmithwins Member

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    The notched hammers get hung up on the firing pin when you have a unshrouded bolt carrier. This damages the firing pin retaining pin as well as the firing pin.

    They have no positive value.

    BSW
     
  7. taliv

    taliv Moderator

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    ?

    if you have a shrouded carrier, it doesn't matter. if you have an unshrouded, use the notched.
     
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