I just stumbled upon an interesting upper, in the original box.  The upper has been removed from the box and fiddled with, but unfired other than factory.  

The upper is an M4 upper with 16" 1/9 HBAR barrel dated 9/95.  Interesting that the box is dated to the barrel.  The receiver is M4 flat top with no T markings, AF C raised forge markings.  M4 hand guards, green paint mark on front sight aperture, silver index washer for flash hider.  It appears that there was rear BUIS installed.  The FSB is F marked and has a bayonet lug

The box has a COLT SPORTER blue label, with an orange sticker marked "COLSC" over the lower left corner of the blue label.  

Funny, the box also has a red hand stamp on it, " WARNING! THIS CONVERSION CAN ONLY BE INSTALLED ON PRE 9-13-94 AR--15 OR SPORTER MARKED GUNS."

I haven't seen anything like this before.  All the ban era Colt conversion kits that I had seen where neutered.  What does COLSC stand for?  Is there any collector value to this, or should I blast away?

Sounds like a pretty standard LE6721 conversion upper for the time period.

Not sure what "COLSC" stands for off top of my head, but it may have something to do with an LE distributor, or maybe just a distributor in general.  

Also not sure how interested collectors might be in a ban-era "no ban" conversion upper, but having the original box and the distinctive labels is pretty cool if nothing else.  Even as the rest of the gun industry struggles for "regular retail" stuff, the collector's market on a lot of things has gone a little nuts.    

~Augee

The AR6721 is called a "Colt Tactical Carbine" so maybe COLSC stands for Colt Special Carbine or Colt Security Carbine.