I have an OG Surgeon 591 SA with a “C” prefix serial back when Wade was still making them in Prague, OK. I bought this new back in 2012-ish time period. Jon Beanland chambered and fitted the barrel. It’s a bartlein M24 or MTU at 24” in 6.5x47L. The barrel is threaded 5/8x24. According to my log...