Nemo makes a few ar-15/ar-10s that have that finish. They get a lot of money for that stuff. I actually live in near the desert, I painted one of my ar-15's that tan color, after a few years dragging it through classes and shoots, mine looks similar to yours. One day, I'll strip off he old paint and either go back to black or tan and start all over again. I like the finish you put on that rifle, and I admire the work you put into it.