[jamesb]

The ones I have seen similar to that are going around the $600-$700 range MINUS the BCG.

You can get BCM uppers minus the BCG and charging handle for $450 -529. You just need to keep an eye on their site. Whoever is paying $700 for a bushmaster upper is desparate and doesn't know what they are doing.

With that said, you could probably easilly sell it to someone who doesn't know any better for $700-800 because you have a BCG with it and people are buying anything now a days.