Thanks for the ideas Sidelock. I discussed these options with my gunsmith and he suggested a boresnake for now. Rather than modify the rifle's action body he offered to make a custom bore guide fitted to the crown end of the barrel.

One other oddity with my Martini is the rear of the receiver is shaped a bit differently than any others I have seen in pictures. All others have a nearly verticle drop at the rear of the receiver body(action body in my parts list). I see most Martini .22s have a peep site mounted to that verticle surface. On my rifle, there is a rounded gentle slope down to the buttstock, with a slight indentation on the right near the top which is obviously a place to rest the trigger hand thumb. There are no screw holes for a peep site. It is obvious that there has never been any site other than a barrel mounted scope on the rifle. Any suggestions as to the correct model number?