Came across a Colt flat top HBAR upper with 20" barrel 1:9 twist, standard A2 handguards and bird cage flash hider. Includes a BCG with the C proof on the side. No sights.

Nothing particularly notable about the upper, besides being a Colt but might be an interesting addition, particulary if I can find a comparable Colt lower to go with it.

Curious what others have to say. Any intrinsic collector value for Colt ARs?