That is one thing I like about the FX, easy barrel swaps.
One of my coworkers is an air gun guru, he played with mine and tuned it a bit. It is unbelievably accurate, at the old house the Mrs didn’t believe me I could nail a prairie dog in the eye.
Freaked her out that I called the shot.
I am running a Vortex Strike Eagle 1-8 for an optic, it has done well.
Optics for air guns can be troublesome, air guns have a weird recoil impulse that can destroy an optic rated for a .50 BMG.
Make sure your optics are rated for an air unit.
Edit- I need to heed my own advice. I am trying to resist ordering a FX Dreampup but I am having a hard time with it.