In reply to:

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Do not confuse "double underlugs" with the "locking bolt".
Chapuis double SxS rifles have 2 parallel "hooks",[underlugs] one under each barrel, where typical double rifles have one "hook" in between the barrels. British, and most other doubles have 2 narrow "bites". The Chapuis has one WIDE "bite"[locking bolt]. Chapuis claims their system along with the design of the reciever is much stronger than the typical British style action.

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Where would the Demas doubles fit in? It looks to me like they have 3 underlugs.

Erik