A Martini target rifle with scope blocks to possibly install a Unertl or Lyman Targetspot telescope. If the Martini has original iron sights, so much the better. Are you right handed or left handed? The Martini comes both ways. They are priced at about one fifth of what a new one would cost to make. It is the highest quality single shot .22 you can buy for short money. Oh, I just realized that you are looking for a center fire. Forget everything I have said.