I just built my first .308. Its an Aero Precision M5 with a Nickel Boron BCG from Aero. Barrel is a 16" Ballistic Advantage barrel with a mid length gas system with a Seekins adjustable gas block. I do run the gun suppressed for night time pig hunting. The problem im having is im having failure to extract or poor extraction 80% of the time. Either the spent round gets stuck under the extractor and slams into the receiver or it releases the spent casing only have it fall directly on the magazine or just roll out the rifle. I have adjusted the GB as per instructions. I have ran it wet and dry and nothing makes a difference.