The first place I'd check is Precision Firearms. Mark has used various high end barrel blanks to build 6.5 Grendel uppers. Precision Firearms are pricey but they have a great following on this forum. Just curious what part of Southern Indiana your in? I'm just across the border from Indiana in Southern Illinois. I was born and raised in Princeton. Good to see another 6.5 Grendel Shooter in the Tri State.