Sako 85 Black Bear .308 Kahles KX 2-7 4A Shortened to 18" plus suppressor Lapua cases, 150gr Lapua Megas, Fed LR Match, 45gr H4895 Capable of .5 MOA, or less, all day long Great in the tight stuff although a little heavy for mountainous terrain.
That's an interesting set up you have there. Is that can threaded on or clamped somehow? It appears that you would have to run threads over the fluting unless it is some sort of reflex arrangement.