Bergara Barrels, but I have had bad luck with them myself, but they are an option.
www.apachegunworks.com is another. I am not sure what blanks Jim uses but his work is excellent. He built my 6mm-WSM and it is one of the 2 most accurate barrels I have right now. He's built my 450 Bushmaster on a Savage Small shank and it looks great. I am one happy customer.
Sin-Arms (I see you have listed) has also done some work for me in the past and his work was excellent also.
Jim Briggs at Northland is great to deal with and my CBI 6BR I bought from him has been a shooter from day one.
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