I been looking for a Colt AR15 R6600 Green Label and I found one today listed for sale. I mean it it is New, un-fired, NO BOX. Gun looks as said new with the tube from Colt still in the barrel, but the gun dont have a bayo lug on it?? Anyone know what is up with that?

Markings on the gun is

HBAR SPORTER
Serial # SP 242xxx

I think it is one of the last ones make in 89 or maybe a R6600K gun and the kit got lost over the years. No telling.