It is duly noted that the Italian maker Berretta has used the term Monobloc for years. In this case the term means exactly what it says the rear "Bloc" is made of one piece (Mono) of steel with the individual tubes being inserted (From the Front) into the Bloc.
The Belgian Henri Pieper originated the method but did not use the term Monobloc. In his original design the tubes were inserted from the rear of the Bloc, so you see a step where they emerge from the "Bloc". Later he did make barrels with the tubes inserted from the front without the step also. Many Darne (French) barrels were built on this Monobloc principal & they too used a tubed Bloc, not one piece bbls.
