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Is this about the bit above the trigger? That's the fire selector, safe—semi-automatic—fully-automatic, with the later two being marked in red to indicate danger I guess
it's in German - Sicher for safe, Einzelfeuer (single-fire) for semi-auto, and Feuerstoss (which apparently translates to "burst of fire", but I'm pretty sure this is still a full-auto setting, it's just that "burst" in English fire selectors is often assumed to mean "limited burst" (to 2-3 rounds usually))