Hum, I have been using the M-223 Scopes and AR Mounts since they came out. A year before I started doing some work for Nikon by the way. I have had great success shooting stell out to 600 yards using the BDC and Rapid Action Turret models. The 1-4 Point Blank Reticle will hit about whatever you want inside of 200 yards if you zero for 100 yards.
A buddy shoot's 3-gun in NY and has won a comp. and finished in the top 5 a few times using this set up.
If you decide to get one, post a pic when you get it mounted up.
http://i1216.photobucket.com/albums/dd363/bman940/KathyARPBR.jpg