I want an A2 again.
I have a 16" Colt upper (the barrel is marked with a C) with the removeable carry handle and a complete 4 position M-4 stock. Both used, but in good shape. I don't remembr the round count on the upper, but it's about a thousand rounds (I got it used).
I will trade straight across for an A2 upper (you keep your B/BC/CH, I'll keep mine) and a complete (with buffer and buffer spring) A2 stock.