Re: concealed s&w 686
There are many handguns that do not have built in safeties, the safety is between the carrier's ears. Revolvers don't have safeties and a couple of my semi autos do not have safeties, nothing unusual. The key is you keep your finger off the trigger until you are on target, on target on trigger, off target off trigger. You keep your finger off the trigger when you draw the gun. Guns do not just go off when you draw them. There is no problem carrying a revolver concealed as far as safety goes as long as you are not stupid enough to carry it cocked. That said, a 686 with a 6 inch barrel is going to be hard to conceal big time.
When you are up to your butt in alligators, it is hard to remember your intent was to drain the swamp. Stay focused!