An AR refresher fo y'all

 Because I couldn't remember how to zero an AR/M-16 after 30 years.

I remember having to go from one side of the rear site and count how many clicks to center and thought I remembered having to bottom the front site....

Guess you forget things.
But I remember (and why I was looking for the carrying handle) that when you get it sited at 50 MTRs, you're good for 100, 200 and 300 with just a flip of the back site.