In true "sleeving", the shortened monobloc is bored out a bit and a one piece barrel chamber assembly is inserted into the bored out chamber area of the (chamber length) monobloc. Another one piece barrel chamber assembly is inserted in the other bored out chamber and then the two one piece barrel chamber assemblies are then struck, then provided with ribs and soldered together like a normal set of barrels. This service is offered by Kirk Merrington in this country and several sources in the UK. In "lining", a company like Teague (UK) reams out the old barrels and installs a full length liner in the old barrels, fastens it in place by whatever method they choose to use. Presently, Teague seems to only be equipped to do 12 gauge and, by rumor, we understand they may be also doing the 16. The "sleeving" method is about $1400 and up, the Teague "lining" method is well into the two thousand dollar area. Added services mean added total cost.
