Bit of a thread resurrection...

I will hopefully receive a Phoenix Hy-Score pistol in the next couple of weeks, it does not have the silencer included, but am looking to make a suitable adapter on my lathe with 1/2 UNF at one end, and 9/16 BSF at the other.

Reading the above thread, I have located a suitable die, but before I commit to buying it, did the conclusion of the wise members prove that it was indeed the correct thread specification?