Have blackhawk new model 44 mag with 10 1/2" barrel.Currently has aimpoint 2000 red dot scope on it that died on me.Was on when I bought gun so I don't have origional rear sight.Looked all over web and can't seem to fing one.Anyone know what would be best to get and where ti find.Don't really want to go back to red dot type scope scope if don't have to.If so what would be best power to use in tube scope?