Looking at the image, the Right appears to have the usual relieved thread. The barrel is screwed in by hand until locked in place with a catch.

Sometimes an interupted thread is used, grooves through the thread allowing the barrel to be slid straight in, a turn and locked into place.

The Westley Richards does not have a visible thread? Is the takedown thethod where the barrel fits into the action and bolt locks up directly into the barrel collar?

A method used on some modern designs.

Quote:

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These rifles show two examples of early takedown, or detachable-barrel, bolt actions. The Westley Richards in .425 Magnum Express, top, features a dropbox magazine, which allows the shooter to quickly reload via stripper clips. The Rigby has a threaded barrel and receiver for assembly and disassembly.

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