So I went and took one of these 45* elbows

...and the piece of PVC that fits inside it


Like so

Used a dremel with a sanding drum to reduce the outside diameter 1mm deep

And then black Krylon Fusion...and then used a standard 45* feedneck adapter to make the following


And although the Revvi sits a little high, it clears my red dot and riser JUST finnnnnnne...
from the front

Back [as you view through it]


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