Ontario Hunter
AH ambassador
I would tear off a strip of black Gorilla tape long and wide enough to cover the sight plain on top of the barrel. Residue from the tape is easily removed with WD40.
Soot, perfect answer easily apply with a a match or a candle. Do they still make paper matches-they work great?Easiest ways would be tape, a burlap wrap, or applying a lair of soot over the barrel