I've built one for a customer and one for myself with Odin works 20" barrels. We've both been very happy with them. I've only shot mine at ERGC a couple of times. Both times with the Hornady black, 123gr. Easily sub MOA with very little effort.
Do any shooting with the Wolf steel case stuff? Kind of intrigued by 6.5G but not sure if I want to jump into another more expensive AR caliber (more expensive than 5.56 at least).