If you don't shoot the rifles the inside condition of the barrel doesn't matter. If you do shoot them, the question is how accurate is it? If accuracy is about 3 inches at 100m that is just about what a military rifle should do. Or the loads for that rifle still needs development. If it doesn't group at all, say 6 to 8 inches at 100m irrespective of loads, then the barrel is a problem. Then decide what to do, replace barrel, replace rifle, accept poor grouping, etc.