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What gun (specificaly) is it ?
Since steel doesn't chip easily, I suspect your gun might have an anodized aluminum alloy receiver, which should respond after applying some commercial (Birchwood Casey ?) Aluminum Black touchup after smoothing out (filing) and gouges in the metal.
You can determine an alloy receiver, if a magnet won't stick to it.
Cold Blue touchup won't work on an alloy receiver; Aluminum Black won't work on steel.
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