I can't tell how my front sight is attached, but thank you for asking. Because of your post I took a close look at both front and rear sights.
I found the sight blade on my rear sight has worked loose. It will be easy to tighten, two small allen set screws.
Does anyone know what size allen wrench is needed for those two small screws?
Because it is an "Intertia Driven" action, very little residue get into the action itself (unlike a gas gun). I personally think you could shoot 2K rounds through it without a concern for residue buildup. With that said, the gun will need lubricated on a regular basis.
How often? YMMV