Used, in nice shape. May be Colt but I can't be sure. I bought Colt ones from Dennis Todd, swapped various ones around as I tried different optics/mounts, so I don't know if these are the ones. Actually two out of three they are since I had two Colt M4 setups and one Bushmaster. :) $22 shipped. Money order or PayPal.
p.s. alternate email address is email@example.com, primary ISP is near Houston and is having some Rita impacts apparently