I have an old (1845) 35 cal 1/2 stock rifle with a 39" barrel. the last 4 or so inches from the muzzle are badly pitted with rust, but the rest of the bore looks pretty good using my bore scope. I would like to cut the barrel down to about 32". I would thumb lap the new muzzle end, and cut a new dovetail for the front sight. Is there any thing else I should be aware of , or do, to make this modification?