avoulluz,
Looks like you have 156 post on AGN and i think you may be a contributing member in good standing.
I can 3d print you a barrel band for free. Only charge materials and shipping. So depending on where to ship in the U.S., probably $10. However, you will need a digital caliper to take accurate measurements.
Then you will have to settle for a possible slightly loose fit and use some tape around the barrel or shroud to tighten the fit.
Or plan for a few adjustment based on the initial fit and all done by mail.
If you were my neighbor, I could 3d print and exact fit after a few test prints.
Rod in San Francisco