I have my 74 up and running know and would like to start sighting it in, but I have a few questions:

1. What is the upside down "U" On the back sight called?

2. What is the sight in distance for this position? Does it have 2 zero distances?

3. Any considerations I should take when sighting in?

4. I have a red dot that I will be placing on the Ultimak gas rail and I have never put one on a gun before. Any recomended zeros for the red dot?

Thank you guys