WC
It is not a matter of whether the gun is an A&D or not. This can be done on most guns which have manual safeties. I have both a J P Sauer & a J P Clabrough, both sidelocks & both with auto safetis. On both however the lever is not latched open but returns to center when the gun is open. I do understand though that some ejector mechanisms will not allow this method of un-cocking.
In these regards a Lefever is one of the most user friendly guns I know of. These can be taken apart or re-assembled with the hammers cocked or un-cocked whether ejector or extractor. While the lever does latch open as long a the gun has the three position safety (most do) the hammers can be let down by this method & again it matters not if ejector or extractor, at least for the in-frame ejectors which are the most common ejectors found on them.
