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    Blue Plastic-Like Residue Seen in Borescope

    They're the only way to really know if your cleaning regime, ideally minimal, is really working. Now that they're so cheap, it's a worthy investment even for moderately serious shooters.
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    Blue Plastic-Like Residue Seen in Borescope

    Copper.
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    Beretta 390 / 3901 safety button showing red when on “safe”?

    A little bit of red when on "safe", a lot of red when it's not. Normal. Not ideal.
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