I had a similiar post up last week. I was away for a few days on NG Drill and missed some deals so I wanted to get this back out there.
Swap my Rock River Arms 20" A2 complete upper for an 16" upper. HBAR, M4, it doesn't really matter.
We could keep our own bolt groups or swap that as well but this upper only has 300 rounds thru it and is almost new. Bolts can interchange with a like upper no problem.
I would much prefer to not have to make a trade plus cash arrangements.
I do have a brand new Bushmaster A2 complete buttstock assembly to negotiate with as well if that can help make the trade happen so keep that in mind as well.
Let me know,