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Thomas, yes, there are companies that offer this service. Briley is a great example : http://www.brileygunsmithing.com/c-879-full-list-of-shotgun-gunsmithing-pricing.aspx
Determine if your gun has chrome lined barrels and then contact a gunsmith. Chromed barrels are a problem to re-choke. Buying an extra set of barrels for the gun may be an option too.
Hi Thomas - It is possible to 'bore it out' a bit. One can also have the barrel machined and threaded to accept choke tubes. A good gunsmith could probably do this for you, and there are several different companies on the internet who will do the work. It would probably run around $100 for the 'bore job', give or take. .
Boring out a barrel is done a lot on skeet guns If you decide to stay with fixed chokes I would suggest boring them to light mod and Mod. Briley MFG is who I would suggest they can bore them out or install choke tubes https://www.briley.com/