And found some colt uppers, or least that's what they were suposed to be.  I noticed several used configurations, and saw that there appeared to be two types of barrels.  One finished like the civie colts and bushy's, flat black, I guess a mag phos. finish, and a couple had what looked like I've seen on M16's.  Kind of a greenish tint, "ridged" type finish, if that makes sense.   Another thing I noticed was that the machining on the uppers and lowers of the bushy's looked FAR better than the colts.   Chnaged my mind on which one I'm going to buy in a couple of months...well maybe sept.  I'd also like to try my hand at a build, and although I liked the Colt barrels, that'll probably be the only part I'll use from colt.  Not to start an argument here, some my observations today.  YMMV.

Anyone know about the two different barrels I saw?   Oh, and ammo seems to be harder to get and more $$