I very nearly bought an island lock hammer Holland & Holland that had been sleeved. I hesitated and missed it, but a member here gave me a very hard time because the gun was sleeved. I would have shot the gun and enjoyed it, especially at the right price. The hard time had nothing to do with me missing the opportunity, but I was surprised by how emphatic he was that I not buy a sleeved gun. To me it was just a practical way to extend the field shooting life of a good, old gun and the sleeve job was fairly reflected in the asking price.