Umarex VP9 upgrades?

[Discypherz]

Hey, I recently bought a Umarex VP9. I am wondering if there are any upgrades that I can get? I have searched for awhile now but no luck. I have seen things like the crusader and taitan parts but in looking for inner barrel type of stuff. To make it shoot more accurately, consistent and farther range because it doesnt shoot as well as I'd like. 

Thanks!