The 6ARC gas gun has a 20" Ballistic Advantage DMR barrel. I've looked around here and even posted on this same subject before, but I simply cannot seem to make up my mind. Hoping to spend less than $1K. What suggestions for a rifle scope? Last post I put a few examples of what I was considering. This time, I'll just ask the forum if you were building the same rifle, what would you choose for the optic?