From my research, Kidd...
http://www.canadiangunnutz.com/forum/showthread.php?t=564088
There are many complaints about GM on Rimfirecentral. Their quality control seems to be hit-and-miss... and you see a lot of them for sale on US forums. But it's tough to say, as most rimfire testing is done at only 50 yards, which tells you absolutely nothing about how they perform at longer distances. The real test of a rimfire barrel is 200 yard results for me. I want 20 shot groups that are clay pigeon size (at most) under calm conditions. Agent Mango's GM barrel performs well at long range, but I didn't feel like taking the gamble.
Needless to say, I just ordered a Kidd barrel from Fabsports... we'll see how it performs.
Actually my barrel is a butler creek 20" SS fluted. I never had to choose the barrel, as I bought the gun from my brother, who had bought it from someone else.
If I were to build a long-range 10/22 now I'd probably drink the Kidd or Shilen cool-aid.
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