Every S&W revolver I purchase, used or new, gets broken down, cleaned, lubricated, and polished if needed. Not hard to clean up a smith.

I've purchased factory new 629s, 686s, and a 617. Most have come from the factory bone dry. Myself, I will install a good aftermarket spring kit. There's many out there there that are good. Double actions are around 9 lbs, single between 3-3.5. Simply polish a couple areas and a little Breakfree CLP works wonders. Shoots good, lasts long time.