My 2016 627-5 S&W Pro model
This is a 8-round revolver with a cylinder machined for moon-clips; 4" flat-sided barrel.
I've got ~5600 rounds through it, but admittedly, I don't get around to shooting it much. I probably shoot my regular carry guns much more. Too many guns; too little ammo on hand; too little time; and more guns added to my inventory each year. I've since replaced the lock with one of those plug-kits, but the lock never gave me a problem before that change.