Learning how to disassemble and reassemble firearms can be a pretty difficult task. In particular, or rifles are more difficult than most. I am still learning the ins and outs of these particular rifles and it has definitely been a challenge.
Daniel Defense rifles, Magpul attire, SureFires, Aimpoint, and Trijicons. Photo by Stickman. Really look at the variations in lighting uses and optics. Took me a sec to see the little RMR side mounted with the big Triji on the top.