All 412's came with an auto safety, and i "hate" auto safeties!  So i figured out a way to deactivate it...  I offered it as an option and sold a lot of them...
  Valmet sent me some parts and asked me to modify them, for them to look at....i did so, and they later offered a way to disengage the safeties on there trap/skeet models, but not their regular models....
  DM