'Are not all mono-blocked shotguns essentially sleeved? Seems that they are very reliable if so. If that's correct I would think properly done work on an existing gun would be also.'
Yes the process is similar.
However the major difference is that the breech block on a modern O/U or S/S with 'sleeved in' tubes is usually a single block of metal which incorporates lumps, ejector/extractor tunnels, any top extension and of course the breech stubs into which the tubes are sleeved.
Also some modern 'sleeved in' barrel sets use a tube that only goes so far as a shoulder machined into the breech block rather than all the way to the rim recess/breech face, the logic being (as I understand it) that having the joint within the chamber, it is less visible (!?).
Last edited by Toby Barclay; 12/26/19 02:39 PM.
