RDIAS typically goes for more than a converted receiver, but not as much as real M16.

RDIAS is nice as if you have catastrophic failure, you can pick the RDIAS out of the rubble and install in new host gun and you are good to go. You blow up a registered receiver and there will be much wailing and gnashing of teeth.

"Cheap" receiver conversions are going for between 8500 - 11000 right now.
RDIAS around 10000 - 12000
M16 receivers are 10000 and up.

Not sure on Lightning Links as I am not in the market for those...

Damn ridiculous pricing...