Is there a problem with it? How's it shoot? Accurate? Good on air? How much shots per fill has it got and how much paint do you hold.
If it fails on any of these then look at upgrading. If not then save money and spend it on paint and event tickets/walk ons
Personally the only thing I change on any of my markers is the barrel. Paint to barrel match is the only thing that makes a difference IMO.
If it ain't broke don't fix it