Gunsmith Recommendation Needed: revolver barrel chop

[40Arpent]

I have a 6.5” Ruger Single Six .22/.22WMR that I’d like to have cut down to 4.5”. Does anyone have a recommendation for a trustworthy, top-notch gunsmith to perform this task? Alternatively, I guess I could do a barrel swap, but I’m not sure if such barrels are available. Advice would be appreciated.

Thanks,

Pete