I've had a Nikon Pro Staff 3-9X40 for years. It's very clear and has withstood a lot of slapping around on an FN FAL.
They've been discontinued but you can still find them in stock here and there.
This place is blowing them out for $100.
https://www.fieldandstreamshop.com/...7nknunkn39x40bdcopt/17nknunkn39x40bdcopt