A gun that has the barrels cut off ahead of the chambers is not neccesarily a "mono bloc". The "bloc" could have been made from many pieces at the time of construction. The only gun that should be referred to as a "monobloc" is a gun whose barrel breech section is one piece of steel or aluminum with tubes inserted. A gun whose barrels are cut off ahead of the chambers after initial construction and tubes inserted is considered to have been "sleeved". It may have been made as a monobloc or it may not have been made as a monobloc.