Take a look at U.S. Optics web-page -- very, very, expensive scopes and "special ops" sighting stuff.
Their lighted SN-4 has amazing clarity and is available with a screw-on magnification doubler that provides 8x. It was designed for the M-16 and sells to "elite" folks. It is a little bulky; but built to survive a nuclear blast.
Also, don't overlook "plain 'ol scopes." I mounted a Burris 3x-9x 32mm "Compact" on an AR with a 20" barrel. It works very nicely.
The little Burris has excellent optics and is an attractive matte black that looks "right" on the gun. It is built like a little tank, and costs half the price of a "tactical" scope!
With all that said -- I'm don't think I would put any kind of scope on an AR with an 11" barrel!
Good luck,
Kurt
[This message has been edited by Kurt (edited 01-30-99).]
[This message has been edited by Kurt (edited 01-30-99).]