If you can use a 3.5-10, I have a Bushnell Prime on a Marlin Model 60 stainless and it's a tack driver. It will focus down to 10 yards. Hardly a day goes by that I'm not shooting it. I use it to knock off rats and starlings that come to my bird feeders on the other side of my property. Bushnell has discontinued it and it's on sale 1/2 price at some online retailers for under $80. It is not air-gun rated, though.