Internal lock, no thanks. I detest those things for three reasons - you cannot do a proper trigger job on them, they make the frame bulk out like the gun needs a diet, and they are a throwback to S&W's sellout. They should get rid of them entirely, NO ONE uses them.
This 586 is a little less chunky than its other bretheren and I do like that they're going back to wood stocks, but I would rather grace my safe with an original 586. In fact I just added it's stainless brother (original no dash with Goncalo Alves targets) to the collection which should ship tomorrow.