I'm building a 6.8 upper and the last part I have to order is the gas block. Should I get an adjustable gas block if I plan to shoot hot loads (120gr SST with AA2200)? Of course it doesn't hurt to get an adjustable gas block to fine tune the rifle, but it is one more thing that can go wrong. I'm just wondering with max loads, is there a benefit like reducing recoil and would a fixed block be over gassed with hot loads. Wilson Combat just came out with an interesting adjustable gas block 2 days ago with a click adjustment screw, but a bit pricey at $120.