I have tapped out the old ''buckhorn'' sight on my old Cooey-and would like to install a red dot in it's place.I see the Tasco red dot says it fits the 3/8 dovetail on most 22 's-is this refering to the existing dovetail on the barrel-or is ir refering to grooves cut into the barrel[which I don't have]Ifthat doesn't work-are there any non gunsmith options?This is an old $25 single shot cooey project I am just playing around with,not worth putting serious money into.The stock is a nice piece of walnut, though,and I have slimmed that down and sanded it-it should come up nice.