You can get a Storm Lake conversion barrel to use or I've read people just using factory 9mm barrels. Some have said they have even used the .40 mags for 9mm and has worked. Others said theirs wouldn't.
When did you order yours?
Quantico Tactical says they can get them but can't give a firm delivery time. Might give them a call. Local shop has one in stock, but I too hate to pay full price, which I think is around $600-$625 there. Thinking of just putting a 9mm barrel in my full size 40 till...