The only true way to tell, is to mic the barrels, for thickness. If they are thick enough, they can be honed to the max, to see if the pitting clears up, and then if not, you can have them sleeved. A wooden dowel rod, close to the bore size, can be split about 2" back and then you would insert a wood screw to tighten and expand to the inside of the bore, then slid back out and miced to give you the inside diameter, and then mic the outside at the same point, subtract the inside from the outside, divide by 2 and this is your wall thickness...I think? Now this is info just to get you in the ballpark, If you want to know for sure, or you think they may be borderline, a competent gunsmith is gonna be a necessity.
binko
