I spent $100 or so on a tapered red dot laser one that you insert into the end of the barrel. It has different plastic fittings for various bore sizes. It was a bit fidly and worked ok but I wouldn't waste my money again, it's just as easy to bore site looking straight down the barrel as suggested by gadgetman. I now use the laser sight to play with the cats as I hardly ever need to bore site once the rifle is sighted in. Once your on the target at 25m or so it's reasonably straight forward to site in from there.
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