By my books the 223AI seems to be set up the same as all the other AI acrtridges in respect to the neck/shoulder point. As Blue Avenger stated the Lee Collet die works well with other AI cases, it works great with my 243AI. I don't see any reason why a Lee collet die for 223 wouldn't work for you. For what its worth, instead of just ordering a Collet die I would go ahead and get the Lee Delux die set. It's usually only a couple bucks more for the entire set versus just the Collet Die.

I use the 243 Deluxe die set for my 243AI and the Collet die and the Dead Length Seater work great. The factory crimp die works with it too. 223 set should work with the 223AI.