I have a William Moore 12 gauge hammer gun that has been sleeved. The joint is invisible, except for a small area under the forearm. Whoever did the bluing matched the damascus monoblock and the sleeved barrels so well that you are barely able to tell that the two are of different composition except in very bright sunlight. I have no idea who did the work, but it is as good a sleeving job as ever I've examined. In addition, it really is a very nice gun, probably one of the two nicest I own.