a better place to ask is on the yellow forum.
Still the following needs to be known
Make, model, and a general idea of what you want done.
I can also say that most of the air gun guys are really backed up.
Barrel work on some models is not quite as demanding as a rim fire, on others it is just as or worse as the transfer port has to be just right. There might also be an issue with the valve again depending on where you are trying to go.
