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Thread: Firing pin retaining pin issue

  1. #11
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    Anyone able to post a side by side pic of an AR firing pin and an M16 firing pin? I've heard they were different but don't know what to look for. Can the M16 fp's be used in a semi auto?

  2. #12
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    Quote Originally Posted by Peacekeeper1408 View Post
    Anyone able to post a side by side pic of an AR firing pin and an M16 firing pin? I've heard they were different but don't know what to look for. Can the M16 fp's be used in a semi auto?
    The 16 has a wider collar. I don't think it will fit in an AR carrier.

    (Another reason to just run 16 BCGs in everything)
    "You people have too much time on your hands." - scottryan

  3. #13
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    Quote Originally Posted by Rmplstlskn View Post
    My Colt M4 does the same thing.... beats the retaining pin pretty hard.

    I just ordered the following...

    PERM PIN Retainer

    That should take care of it...

    Rmpl
    I wouldn't use one of those in my gun on a dare.

  4. #14
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    Quote Originally Posted by Kurt Reifert View Post
    I wouldn't use one of those in my gun on a dare.
    I have never even seen one let alone used one, so I have to ask why not use it?
    "Intelligence is not the ability to regurgitate information. It is the ability to make sound decisions on a consistent basis "--me

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  5. #15
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    Quote Originally Posted by Kurt Reifert View Post
    I wouldn't use one of those in my gun on a dare.
    This is the first negative feedbacks on this item I have ever seen... Normally the feedback is "no problems" or "no deformations" etc...

    Otherwise...

    I just checked out my all COLT BCG used in my Colt-barreled M4... It is half-round with a RAMP, not shrouded. It has an M16 firing pin (not original, as my original succumbed to the pit caused by various pierced Winchester primers I had during handload tests before I switched to CCI primers).

    The firing pin lip, while looking through the retaining pin hole, is just over 50% the diameter of the pin. An AR15 firing pin I have is just less than 50%... The difference is in the thousandths of an inch area...

    My retaining pin had a good gouge from the firing pin on one of the legs... Maker of the pin is unknown, but was bought somewhere from a reliable vendor, so an inferior pin is unlikely. I have also periodically replaced this retaining pin as it gets banged up enough for concern...

    The face of the "H" LMT buffer also has surface marring...

    My M4 is not a COLT FACTORY build, but rather a build from "munyguru" on TOS. He had a builder he trusts build it and then they refinished it all in a dark black, so it is a PARTS GUN technically.

    If this deformation is not NORMAL for an M4 with a ramped, 1/2 carrier BCG, then can someone suggest where the problem lies? Gas port size?

    Rmpl
    "Our destruction... will be from another quarter. From the inattention of the people to the concerns of their government, from their carelessness and negligence..."
    ...Daniel Webster, June 1, 1837

  6. #16
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    Quote Originally Posted by Rmplstlskn View Post
    This is the first negative feedbacks on this item I have ever seen... Normally the feedback is "no problems" or "no deformations" etc...

    Otherwise...

    I just checked out my all COLT BCG used in my Colt-barreled M4... It is half-round with a RAMP, not shrouded. It has an M16 firing pin (not original, as my original succumbed to the pit caused by various pierced Winchester primers I had during handload tests before I switched to CCI primers).

    The firing pin lip, while looking through the retaining pin hole, is just over 50% the diameter of the pin. An AR15 firing pin I have is just less than 50%... The difference is in the thousandths of an inch area...

    My retaining pin had a good gouge from the firing pin on one of the legs... Maker of the pin is unknown, but was bought somewhere from a reliable vendor, so an inferior pin is unlikely. I have also periodically replaced this retaining pin as it gets banged up enough for concern...

    The face of the "H" LMT buffer also has surface marring...

    My M4 is not a COLT FACTORY build, but rather a build from "munyguru" on TOS. He had a builder he trusts build it and then they refinished it all in a dark black, so it is a PARTS GUN technically.

    If this deformation is not NORMAL for an M4 with a ramped, 1/2 carrier BCG, then can someone suggest where the problem lies? Gas port size?

    Rmpl
    I'm no expert but it looks like BCG "Bounce" to me. Damage to face of buffer and pin having damage. Something is not right.


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  7. #17
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    First a BCM carrier is shrouded meaning it's not the firing pin that cocking the hammer it's the carrier (the way it should be, the original design of the system).

    On unshrouded carriers it's the firing pin that cocking the hammer not the carrier. (the non preferred method).

    The non shrouded situation is where the 'fix' is suggested. (adjusting cocked hammer height).

    Like Bill Alexander says if the FPRP is installed correctly (both legs touching the firing pin) then it will last much longer. FWIW I find that FPRPs made by Yellow Tavern to last the longest.
    Chief Armorer for Elite Shooting Sports in Manassas VA
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  8. #18
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    I've only ever seen buffer face damage from 2 things:

    Either an uneven surface of the bolt carrier (easily fixed), or from an improperly machined lower receiver (buffer retainer pin drilled too far rearward). The 1st means just knocking the edges off the carrier and lightly sanding the back edge of the carrier. The 2nd requires a new lower.
    Chief Armorer for Elite Shooting Sports in Manassas VA
    Chief Armorer for Corp Arms (FFL 07-08/SOT 02)

  9. #19
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    Quote Originally Posted by gotm4 View Post
    I've only ever seen buffer face damage from 2 things:

    Either an uneven surface of the bolt carrier (easily fixed), or from an improperly machined lower receiver (buffer retainer pin drilled too far rearward). The 1st means just knocking the edges off the carrier and lightly sanding the back edge of the carrier. The 2nd requires a new lower.
    Looks like I need to break her open and take some pics of the buffer and retaining pin... You guys are pretty busy on SAT, so it is probably not a good idea to bring it in personally for you to look at...

    It is a MEGA Gator lower, BTW. Usually well respected for quality... but a dud is always possible.

    I also remember MG mentioning that the builder checked the gas flow after installing the PRI gas block sight and "opened up" the barrel gas port "slightly." I had thought this pin and buffer face marring was from the port being opened up a bit too much. Otherwise, this M4 has NEVER had a failure not due to ammo or magazine.

    Rmpl
    "Our destruction... will be from another quarter. From the inattention of the people to the concerns of their government, from their carelessness and negligence..."
    ...Daniel Webster, June 1, 1837

  10. #20
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    Quote Originally Posted by Rmplstlskn View Post
    The face of the "H" LMT buffer also has surface marring...

    Rmpl
    Please describe this marring or show a pic. If its just light stuff then its normal.

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