Look at the attached Beretta schematic. Lower left corner there is a diagram of the automatic safety. You need part no. 99 to go away.
Just left of the schematic that shows part no. 99, you will see a diagram with parts 86, 101 and 102. Those parts are a hammer block that prevents the hammers from hitting the firing pin if you bump the triggers before the gun is fully closed.
I have a 686 that was modified by just removing the linkage and it's never been an issue. But if you pull apart a newer 682 manual safety gun - the hammer block parts are there. I'm sure its legal CYA. But if you are going to modify the safety, you should be aware of what the results are.
Prepare to cringe on this solution! If you want to permanently disarm the auto safety, you don't have to take anything apart. Part 89 is what sets the safety when the locking latch moves to the rear upon opening the gun. Just cut off the hanging down finger that contacts the locking latch (27) with a Dremel tool cutting disk and its done!