I have an itch for a S&W J-frame airweight revolver. Does anyone have a recommendation of the 442/642 with no external hammer as compared to the 638 with the shrouded hammer to the 637 with the full external hammer? This would obviously be a carry, self-defense gun, but would also be nice to be able to have some decent, snake-head accuracy at snake encountering distances out in the bush. Thoughts? I would appreciate any help or advice.