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Thread: Barrel cleaned?

  1. #1
    Junior Member
    Join Date
    Dec 2017
    Location
    swiss
    Posts
    4

    Default Barrel cleaned?

    During disassembly I discovered these receivers ...
    What rubbed something off or what could have caused it?

    Greeting and Thanks for Help

    Gesendet von meinem MHA-L29 mit Tapatalk
    Last edited by Fabi; 05-13-2018 at 08:36 PM. Reason: Please move to Forum: Frequently Asked Questions. Sorry

  2. #2
    Senior Member
    Join Date
    Dec 2013
    Location
    TEXAS
    Posts
    5,363

    Default

    Any acid based substance can remove bluing.

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