You're welcome. This ruling DOES bring about a few interesting questions.
For instance, if you have a new stripped lower, can you build it into a pistol FIRST, then go ahead and build it into what ever rifle configuration you want to build it into, and then convert it to a PISTOL again??
If so, constructive posession becomes more dubious. as long as you own a pistol buffer tube, you could own short barrel uppers for any ar that you built, provided you build it into a pistol FIRST.......hmmm....
It's really quite interesting.