Whats a good red dot sighting system for the Benelli Nova. Any recommendations? Are there any cheaper ones out there that work good? I don't want to spend the scratch for an EOtech or Aimpoint right now. What about mounting a Nikon buckmaster 3-9X40 on it? Do they make any attachments or am I going to have to drill and tap it? Basically, I want to red dot it or scope it, I want a more precise sighting system.