The 547's have the advantage of not needing moonclips, there is a very sophisticated extractor system. In addition, the size and weight of a 4" K frame handles the snappiness of the 9mm round a lot better than a J frame. However, the one I had, the trigger was not much fun, no where near as smooth and nice as my 940. I agree with what has been said about the triggers on 940's generally, and the need for honing the chambers if you want reliable extraction. They are both out there, just have to be on the lookout.

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Ed