I recently picked up a Colt A1 upper, with teardrop forward assist, triangle handguards, and 15" bbl with permanently attached 3-prong flash hider. I didn't get a bolt, bolt carrier, or charging handle with the upper.
It was built as an attempt to recreate the Colt 605 carbine. (The 605's didn't have forward assists, though, IIRC.)
The upper is currently sitting on a brand-new, unfired DoubleStar A2 lower, with used A1 grip and new 4-position stock. I have a new, unfired B/BC/CH sitting in the rifle.
If you want just the upper, I'd let it go for $275. If you want the new B/BC/CH, it'll be an extra $125.
Or, I'll sell you the entire rifle for $650, shipped.