The boy's have a hankering (and so do I) to put a dent in the squirrel population and I'm looking for recommendations. They have a .22, but it's Marlin pump and I don't think it's set up to receivec a scope. I think I'd like to stick with a .22, but am looking for something I can mount a scope on and they can really practice their shooting at something other than paper targets. Oh yeah, they're both lefties and one of them is right eye dominant. So, I'm thinking bolt actions are out. Any advice?