Air Arms Prosport

Yes the Pro Sport shroud is glued/epoxied on from the factory. With some very careful heating they can be removed but I don't recommend it!
Air Arms takes great care in barrel prep and really shouldn't be anything wrong with the crown.
Although I have read a couple treads on barrels in recent years being a little oversized on the bore especially in .22! Jim at ARH for one has mentioned it! If you're having accuracy issues you need to find a good snug fitting pellet. Something that takes a little pressure to push it in the breach! H&N FTTs in 5.53 head size is good place to start.