Colt AR15A2HB Sporter II question

[No.6]

One for the old schoolers....
Some where back in the last century (mid-80's) I had a Colt AR15A2HB Sporter II. IIRC, it was a 20", round hand guard, A2 upper, forward assist, bayonet lug. Anyone know the model number or where I might find one?

[cqbdriver]

Looks like it is the R6600 according to this:

http://biggerhammer.net/ar15/variants/

[No.6]

Looks like the one. Thanks for the info.