I really don't think an optic would have been used with a flare rifle.
Those holes look like assembly/disassembly access holes.
And the slot looks like it serves some type of purpose.
Is the metal visible through the slot part of the ejector?
It is also possible, though unlikely in my opinion, that that was a provision for a fixed mount -- such as when the RV85 was used as a riot gun, shooting CS.
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Don't even try it. It's even worse than the internet would lead you to believe.
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