Best to probably get it rebarrelled, take off barrels are a hit and miss proposition.
Get hold of Rembo or cccan, they do go work with Bevin King barrels.
Other options are D. Henry @ 403-748-3030, but your gonna have a bit of a wait.
P. Reiben @ Rangeland Sports in BC does awesome work and has decent turn around time.
As I see it you have 3 home grown choices for barrels, Ron Smiths RKS tubes, Ted Gailliards match tubes and Bevin Kings tubes.
Good luck.