New Magpul PRS Dark Earth.
I purchased it at the Shot Show. It was the last Dark Earth PRS they had for the M16, and they weren't willing to give a box or rear screw. I'm throwing in the screw that SHOULD work for it. But, I haven't put it on my gun, so no promises.
$220 +3% paypal shipped.
I'll ship it Asap after I get paypal, but not guaranteed the same day.