I snagged a few Colt AR6721's and they are now online. If you have been wanting one go to the link below and order it now. These will be gone shortly.
http://www.jlowesguns.com/Colt-AR6721-Tactical-Carbine-HBAR-MD-Compliant-_p_60.html
http://www.jlowesguns.com/Colt-AR6721-Tactical-Carbine-HBAR-MD-Compliant-_p_60.html