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AR15 firing pin retaining pin

Discussion in 'Rifle Discussion' started by FA9, Nov 23, 2015.

  1. FA9

    FA9 Hillsburrito, ORgun Well-Known Member

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    What would cause the cotter pin to break? I would say an estimated 200-250 rds on bcg.
     
  2. Medic!

    Medic! What just happened? Has eagle eyes. But cant remember what he saw. Bronze Supporter

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    A punctured/blown primer?
     
  3. Capn Jack

    Capn Jack Wet-Stern Washington Bronze Supporter Bronze Supporter

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    What does the tip of the firing pin look like ?
    Is it burned and pitted?
     
  4. FA9

    FA9 Hillsburrito, ORgun Well-Known Member

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    Firing pin looks fine, but when I took out the cotter pin guess what? Another broken cotter pin.

    I'm shooting my reloads(cci primer, mixed headstamp brass, 26.1gr cfe223, 55gr fmjbt chronyed @2759 fps out of a 16in barrel.
     
  5. rick benjamin

    rick benjamin USA, Or, Damascus Secure the drama Silver Supporter 2016 Volunteer

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    Wondering if there's a batch of cheap aftermarket retaining pins out there?
    Should be made from hard steel and heat treated.
    Don't bend, spread, etc.
    Never force, it should slide in.
    Wonder if heat treatment was omitted in a batch?
    Recently one broke and jammed the gun
    Also saw a gas port screw break off recently.
     
  6. FA9

    FA9 Hillsburrito, ORgun Well-Known Member

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    Hmmm that's what I'm wondering. I got 2 pins from a friend, and he doesnt know where they came from. I'm thinking of buying this http://www.cheaperthandirt.com/product/2-KNSPERMA but $7.50:mad:
     
  7. rick benjamin

    rick benjamin USA, Or, Damascus Secure the drama Silver Supporter 2016 Volunteer

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    Considering the carbon build-up in the bolt carrier
    Ought to field strip it every day
    Inspect the carrier, bolt gas rings, bolt face, extractor, firing pin, retaining pin.
    Scrub, scrub scrub.
    Maybe a contributing factor was dirty jammed firing pin?
    Scrub Scrub Scrub