I might be wrong but I'm going to be running a
16" 1:7 barrel, And I will really not be ranging past 300 meters. It seems like an overkill? 300 is the second setting. Will never use higher, unless someone knows of a 16" barrel that give more more distance. I'm new to AR building , but from what I've been told, I will not get much more out of a 16" barrel. If I could ,the Matech would be worth it.