Yeah, I believe the tool to adjust the rear sight is called a "rear sight adjustment tool". Or maybe its an A1 style rear sight adjustment tool, either way mine were pretty good to go out of the box aside from front sight post elevation(I believe its because the sights weren't zeroed on a pistol, if at all). Luckily for me I did not have to adjust my rear sight, but it seems you could use a small punch, allen key, or maybe even a bullet nose tip to push in the pin that keeps the rear windage wheel/sight from moving.
Personally I love the fact that you do need tools to adjust the rear sight as I don't have to worry about rezeroing my gun every time I throw it in a bag or accidentally bump my adjustments while lugging it around. Not that rezeroing A2 style sights is all that hard, especially if you marked your zeros, but for a SHTF scenario it seems like one less thing to have to worry about.