Just iron sights on the M4.
I have a UR308. It's basically an AR10 with some work done. It has a 20" stainless barrel with a 1/4" wall, some trigger work and a couple other details. It's my baby. I can reach out and touch someone at 1,000 meters with it. As soon as I get rich and famous, I want to get a Barrett M82 A1.
