How do you take a barrel band off ?
Just wondering if I can do this myself without a big journey to the gunsmith.
Regards.

Are you asking about a barrel band that goes around the forend and barrel, or one that is around the barrel ?  the former as mentioned are usually fastened mechanically with pins screws or a spring clip.   the latter are usually soldered to the barrel though some may be simply 'shrink-fit", depending ton the barrel configuration.

Nero,
As I said earlier a picture would help. What is the make of the rifle and what model? Barrel bands with a sling mounting are made often with a smaller hole in the band so that when they are being fitted the gunsmith can remove what metal needs to be removed to get a close fit on the barrel.
Perhaps it was fitted by a previous owner who didn't have the necessary tooling to remove surplus metal to get the band in the correct position or perhaps wasn't bothered. As to how it was secured, well if the band is unbroken (solid) it could be soldered, silver soldered and even epoxied in place these days or may even have been shrunk on.   It would be difficult to tell for someone who isn't a gunsmith, and it may even deter a gunsmith in some cases. As I said pictures (close up's) may help.

Harry