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Thread: Witness marks in upper from BCG cam pin

  1. #31
    Join Date
    Jul 2008
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    Quote Originally Posted by danpass View Post
    I wouldn't be changing anything.


    Consider:

    It is only about 200 rounds thru the sytem and it is still contacting the upper based on adding some grease and seeing it wiped away, and a 'step' in effort when pulling on the charging handle, therefore its obvious that it is still clearancing itself (and will do so to a certain point).

    I was simply considering taking that eventual additional clearancing, since it is going to happen anyway, to that certain point manually in order to avoid having it done with the cam pin directly. Everything that is connected to the cam pin is participating in the process, I don't like that.
    I hear you...but I'm saying that it's going to be difficult to know when to stop, and that everything that's participating in the process is doing it against relatively soft metal...I truly think you'll be going down a dangerous road when there aren't any demonstrable downsides to leaving it be.

  2. #32
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    Nov 2007
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    Quote Originally Posted by thopkins22 View Post
    I hear you...but I'm saying that it's going to be difficult to know when to stop, and that everything that's participating in the process is doing it against relatively soft metal...I truly think you'll be going down a dangerous road when there aren't any demonstrable downsides to leaving it be.
    Well I certainly wasn't considering going full retard with a dremel or anything lol.

    Just a swipe or two, literally, with a small file, test and see, perhaps another swipe-and-done type of thing.
    Dan Miami, FL

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