A pistol marked RRA complete lower is running in the $350-$400 range. (Depending where you are of course) There will be at least one seller at the both of the gunshows in Houston next weekend that have them. If you are in the area and need contact info for the seller, IM or e-mail me.
The short upper alone for a 9mm will run ~ $500 (ballpark, probably a little more) Then you have to have the mag well block and 9mm buffer.
All things being equal, fat people use more soap. (I know I am one.
) High speed, low drag does not even come close to describing ME.