Chuck;
A perfectly fine Glossary already exists, far better than anything I could write up. It is readily available on the home page & presented by HallowellCo. I quote their definition of MonoBlock;
Monoblock barrels - A method of building a pair of barrels where the entire breech end of both barrels and the lumps together are machined from one solid piece of steel. The barrel tubes are then fitted separately into this monoblock and the ribs attached. Often identifiable by a distinctive ring around the barrels about three inches in front of the breech end. The favored jointing method of the Beretta company. ""An incorrect euphemism for sleeved barrels"".
I added the quotes. My first short post was not really intrusive on the thread, & quite suffecient for anyone who cares. The "Arguments" arose from those who obviously Don't.
