Do you see that "ring" on the bottom near the receiver?
It should be spring loaded so keep holding it back and you should be able to detach the rails (at least that's how it worked with my M4).
EDIT: Here's a pic of what should happen (or something similar to this): http://www.quarterbore.com/images/kacm4ras.jpg
http://www.quarterbore.com/images/kacm5ras.jpg
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Last edited by L473ncy; October 2nd, 2010 at 17:57..
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