You picked the best option available for converting to the 6.5 PRC or 300 PRC.
http://northlandshooterssupply.com/ You can get or find pretty much everything you'll need right here.
That smooth barrel nut comes off with a regular old pipe wrench, but you'll want to get the correct barrel nut wrench for the replacement barrel nut you'll want to get with your new barrel. I'm a Criterion fan myself, but I don't believe they are chambering the 6.5 PRC yet. I believe Shilen does however.
God bless you for what you are doing... A man among men.
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