Got my cheap 3 wire set from ebay...kinda hard to use with the cheap digital calipers but the pitch diameter seems to come in around 1.027 or so on the OEM barrel. So within the Class 2B spec as well. Damn I wish I had been able to measure the x-cal one...grrr. Now I need to go buy a nice mic. This is gonna be an expensive barrel before it's all said and done.