I couldn't tell any of you why, but the issue seems to have been in the gas block and/or gas tube. I changed the block and tube to a JP adjustable and replaced the tube while I was at it. Gun is back to shooting nice tight groups. I reinstalled the old block and tube to confirm and that is for sure what the issue was. Interesting part, I put the old block and tube on a different rifle and it shot fine. For whatever reason it did not like the mk12. Anyways, thank you to everyone who helped. I'm glad I've got the gun shooting again.
