I'm a bolt action guy looking at getting my first AR. Thinking about a 6920, maybe the Magpul edition.

Question: Can the front sight be removed without a hacksaw? Would you just need a different gas block? Is the sight pinned? If you put a lower power scope on the gun with the sight still on, can it be see through the scope or would it really depend on how high the mount was?

Thanks in advance and forgive me...