Also look at the Trijicon 1-4 one of their reticles is a picket post set up. The post is two thin lines, looks solid but isn't with a solid triangle on top is a different colour, reg or green or amber. Very quick to use and can be used for pinpoint shooting. Close and fast cover aiming point with the triangle, Pinpoint shooting use the top point of the triangle. Similar intent as the above.

Trijicon make scopes that are very rugged/strong and tend to be innovative.