I hear this a lot and think it is funny. People always think that the stuff the military has is good and rugged. In reality, those sights suck. I don't know how many I have seen fall apart after a year of use.
Please forgive me rant and side bar on this thread. I am currently using the DD fixed rear sight. It is what my company provides. They are ok. The cool thing about them is it is set up like the A1 style rear sight. So less stuff going on to mess with. If I was going to try "KISS" as you say, I would look at getting the LMT style or just a straight carrying handle type sight. Either way good luck finding the stuff you like.