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There's a set-screw hidden under the rear sight - it's a retainer for the pin that shows at the back side of the slide, to the left of the rear surface.
That's part of the doohickeys that keep tension on the select-fire lever. You might find that this is loose, and needs to be snugged up.
G18Cs come with the right hex key in the box, but if not, I /think/ I remember that as being a 0.9mm key.
Hope that leads you in the right direction...
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