In reply to:

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The oldest existing firearm maker, which is Beretta, is the real defender of the mono-blocks even for its double rifles, but I have seen some big bores (470 and up) of that Firm carrying demi-blocks. This might be a clue.

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Beretta uses the demi-block barrels on their high-end SxS double rifles. Of course the core design and manufacture of those guns is done for Beretta by Abbiatico and Salvinelli, possibly better known as FAMARS.

When you say Berreta is using the mono-block design for rifles as well, is that on their O/U doubles?

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