The introduction of the "snap" action was one of the great signal events in the development of the breechloading double gun, greeted as the greatest thing since nookie at the time. Indeed, as it's inert predecessors continued to be built in steadily declining numbers, they were often given return springs too (even the Jones) and thus became snap actions themselves. Had there been any need, real or imagined, for the snap action to be operated as an inert action (by returning the opening lever manually when closing the gun) the snap action would have been irrelevant, and all of today's double gun actions would be inert.
It should be operated as the inventors intended. Contrary dogma reflects a profound ignorance of the design.
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"Serious rifles have two barrels, everything else just burns gunpowder."