If you are interested in making your barrel easier to clean, or to shoot longer, you can have the inside of the barrel hard chromed. It does not appear to improve accuracy much, but it makes cleaning a snap. Back in the mid 1970's, I talked to Homer Dangler about this at Friendship, and he sent a barrel off to Marker Machine Company in Charleston, Illinois to have the bore plated. He made up one of his usual fine guns, and tested it. He could not see any real improvement in accuracy, but he told me he never had a gun so easy to clean.