The term "mono-block" refers to a process that is actually done slightly differently.
A 'mono-bloc' or "mono-block" is actually a forged steel block or "lump" that is machined as a one-piece (mono) base, with lugs, and bored to predetermined chamber sizes and over-bored on the forward end to accept tubes or sleeves machined to extremely close tolerances to be fitted and secured into the 'mono-bloc'.
'Sleeving' certainly borrows from the 'mono-bloc' process but differs in that the forged block of steel used in "mono-blocking" is replaced by the shotgun's original breech, chamber, lug section having been cut off just in front of the chambers, then machined to accept new barrel tubes.
'Lining' barrels is yet another process whereby the bores are machined over-size and new high-stress alloy liners are inserted and secured in the original barrels. This process was made popular by Teague of England and I believe they have stopped doing it. The process was very costly and some very pretty but very thin-walled Damascus barrels were ruined in the process.
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"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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