Tapered 314-2
You can take it down to a certain degree, but how far that is, I'm not sure yet.. I took my 314-2 down to about 12.40mm when I first got it for my Samsara about 4 years ago. I also retapered it at the time (lengthened it).....
I just cleaned it up on the lathe the other day and firlgured I'd check the diameter while I was at it. Now, I knew it was getting pretty thin (I play a lot, at least 6 days a week), but I was fairly surprised when it checked in just about 12.10mm... I don't know how much longer I have with it, but with the front 5" being hollow, I can't see it being able to go down much further..
Predators warranty says it is voided for 314-2 under 12.25mm..