Always liked the duplex reticle, but have a rifle in 243 that was my late brothers I have had since he passed in 1995, it is a Bushnell brand with post and crosshairs, and the post can be put up or down by turning a ring.
Bushnell's "Command Post". Always seemed an interesting idea - crosshairs for taking a fine aim (assuming enough light and time) and a post for speed and poor light. It never really seemed to catch on, probably because something like a German Nr 4 or Duplex can do the same job or perhaps a better one, without the additional complexity and potential for failure.
The version I tried of this had a little lever rather than a ring to lift the post into place. IIRC the system used a magnet to actuate the post.
