I recomend that rail by Storm Werkz. How ever, the Storm Werkz QD rail relies on the factory mounting plate, something I hate. There were issues with earlier rifles where the mounting plates were loose, mounted crooked, poor welds, etc. When I removed mine I did so with a screw driver, it popped right off.
That being said, there is NOTHING wrong with the Storm Werkz rails. His stuff is top notch, very nice work! I can't stress enough that the issue is with the factory mounting plate welds, not the Storm Workz quality.
As far as I've seen, the newer rifles don't have the loose plate issue.
If you trully wish to have good solid optics on your rifle with no chance of issues, remove the mounting plate then drill and tap the receiver for a picatinny base. I wish I would have done this first instead of all the other BS I tried. Then again, I didn't have the option of using the Storm Werkz rail back then.
Check out my site for some tips. Maybe I'll update it soon.
http://www.angelfire.com/sk3/volkarmorycustoms/index.htm