Help! Does it matter which way the Trigger Pin & Hammer Pin goes

Discussion in 'AR15/10 Rifles' started by 700man, May 1, 2012.

  1. 700man

    700man Well-Known Member

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    Feb 21, 2008
    Does it matter which way the trigger pin and Hammer pin go in relationship to the two groves on the pins?

    On my rock river the two are closest to the left, on my bushmaster they are closest to the right.

    Just wondering if it matters. Thanks for the help in advance
     
  2. c_bass16

    c_bass16 Well-Known Member

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    Sep 22, 2009
    Makes no difference.
     

  3. threejones

    threejones Well-Known Member

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    Oct 15, 2010
    Whichever side you like, just make sure they both go in on the same side. (I doubt that even that matters)
     
  4. bshaw

    bshaw Active Member

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    Mar 30, 2008
    Mine are always on the right but it makes no difference as long as one of the hammer spring legs are in the grove.
     
  5. GonzoK34

    GonzoK34 Well-Known Member

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    The pins have a relief cut into them and are inserted from the right side with the relief cuts on the right side. There's a spring that press's against the forward hammer pin and lays across the the trigger retaining pin. This prevents the pins from walking out.

    Gonzo
    SEMPER FIDELIS
     
  6. LouBoyd

    LouBoyd Well-Known Member

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    There are many designs of trigger pins not even counting different diameters. All need some form of anti-walk device so the pins don't work their way out of the receiver.

    1. One groove near an inside receiver wall. Use as the trigger pin and held by either side of the hammer spring.
    2. One groove in the center. This is the hammer pin held in place with with a wire spring in the hammer.
    3. One groove in the center, one groove near an inside wall. This is the most common "mil-spec" pin which can be used as either the hammer pin or the trigger pin and nether care which way they're oriented when used with a mil-spec trigger.
    4. One groove near each inside wall, none in the center. Used as the trigger pin for better reliabilty with #1 pin for the hammer. Direction doesn't matter but trigger and hammer pins then aren't interchangable.
    5. Three groove pins to do the jobs of 1 and 4. Reliable when installed but more difficult to assemble.
    6. longer pin with groove on each outside wall for circlip. Easy to assemble/disassemel but easy to lose parts.
    7. straight pin with inside threads on each end. Uses pan head screws on outside. Provides both anti walk and anti rotation. Easy to lose screws.
    8 bare pin with exernal springs mounted to outside of receiver. I can't guess why.

    Various aftermarket trigger makers use the grooves for different things or provide custom pins. Jewell for example provides a spring which will fit on the #3 style pin for the hammer on the right side. I don't have a list of all the possibilities. The logic of the mil-spec #3 pin is that it can be field stripped with just an FMJ bullet tip and the direction or which pin is which doesn't matter.

    Use Google images with "ar-15 trigger pin" to see examples of all of the above.
     
  7. GonzoK34

    GonzoK34 Well-Known Member

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    Nice follow up!
    Gonzo