How to tell where Surgeon 591 was made

In Surgeon's case, it doesn't look like it. They were either made in Oklahoma with the stamp or in Arizona when they were bought by Strategic Armory Corps. According to Surgeon's website, that happened in 2011 - not sure when exactly they swapped over manufacturing to their AZ site. A friend and I both bought 591's off the shelf from Southern Precision Rifles around 2014 and both came with Oklahoma rollmarks. Either SPR had them sitting on the shelf for a while, or Surgeon kept manufacturing in OK for a little while after the buyout.