are there any airgunsmiths
who take the 'droop' out of break-barrel rifles?
If you have access to a bench vise, I say just do it yourself. If you’re doing it often, it makes sense to build a jig but for the occasional need, a vise and a can-do attitude gets the job done. Personally, even if I knew a gunsmith who would do it for free, it’s way more trouble to box it up and ship it than it is to just do it, not to mention the risk of shipping damage.