I agree with Medic72. Even before I enlisted I didn't like optics and extras on rifles. I taught myself marksmanship since neither my daddy nor my granddaddy hunted or shot. I only put a scope on a rifle a couple of years ago because most of the hog hunting I do now in TX is at night.
Yes, a red dot reflexive sight will help for a hurried close range shot but it is not necessary. We've done reflexive fire drills with the M16A2 from 5 to 25 meters away. Basically the target had 3 shapes on it and a shape was called out and we had to turn and shoot and turn away. There is no time to aim. If you don't have a place or time to practice then the red dot is the way to go.
The final point, the more stuff you put on the rifle and depend on the more things can go wrong. Remember, when the zombies come, aim for the head.
YMOS,
Tony
"Let us speak courteously, deal fairly, and keep ourselves armed and ready."
Teddy Roosevelt May 13, 1903