For my friends with AR15 rifles, or rifles with a top rail for that matter, this deal is for a set of BUIS (back up iron sights), that attach to your rail and allow you to use both rail-mounted optics and iron sights without having to flip anything up or take anything off. Made of real metal, not flimsy, designed for real steel weapons, not airsoft.
This is basically the same thing as the very expensive Dueck Defense Rapid Transition Sights [dueckdefense.com] that normally go for $230+ [amazon.com]. These are sold and promoted by surefire as well: http://www.surefire.com/dd-rts-set.html
For $36, cant hurt to try it out!