I have an upper off of a Match Target HBAR. No lug, no threads. It's about 4 years old, but has less then 300 rounds through it and is in very good shape. It came with a compensator, but it sucked so bad i took it off. That left 2 small channels on the barrel where it was pinned. Will not interfer with threading. Would make a great project to de-neuter or do a custom build on. The Colt B/BC/CH does NOT come with it....unless I get a really good offer.
This is a broad list, i know, but here's what I'll trade for: (I'll give or take cash depending)
Free float rail system
vltor, crane or magpul stock
9mm parts(need hammer, bolt, buffer)
lever mounts for Aimpoint or TA01NSN