Sleeving and mono-blocking are similar in appearance. Sleeving is where the breech end of the barrels are cut just forward of the chambers and new tubes precisely fitted into the breech section. Mono-block is a term used in the production of a new SXS or O/U where the breech section of the barrels, including the locking lug and top rib section are machined from a single casting and the barrels fitted as described above... so, 'mono-block' is not really the correct term for what has been done to this gun.
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