From the picture you posted, looking into the muzzle end, I would say the barrels seem not to come together, which is usually a good indicator they have been cut. It also looks to be an 0 grade gun. If they are now 30" and have been cut, they may have originally been 32" and likely full & full. It's been my experience that Parker chokes seem to run close to 3-3.5", so there may still be some constriction; enough that it could still be a good walk-up gun.
Birchwood Casey sells a chemical for stripping blueing and it works pretty quickly. You could then use their browning solution, appled oce or twice and the twist pattern will still be evident. I'm not the one to say what's economical, but I don't think I'd invest in a proper barrel refinishing.
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