I just recently picked up a Rossi Gallery pump .22lr. I can't get it to shoot better that 5 1/2" high with the factory Buckhorn sight. I was only shooting at 25 yards. It has the rimfire dovetail groove on top of the receiver. Rossi makes a plastic picatinny base that will fit it but I would rather get a metal base over the plastic. Does anyone know of a metal dovetail to picatinny base for a rimfire rifle?