Interesting product description.
It does clearly state its threaded, and comes with a flash hider. It also clearly states canadian versions come with a 5rd magazine, but thats the only thing it says about the canadian model being any different that I noticed.
Also, its not just the cost of the threading, 'cause you didn't get a flash hider with it either so add another few bucks.
I too would be upset because of the product description, but I wouldn't be jumping up and down raging over their lack or response. Its Christmas, of course there is going to be a lack of communication around this time of the year.
edit - to everyone who says read the fine print, I dont think that applies in this case. While the product may not be as shown, it SHOULD be as described in the add. The picture can be incorrect, but not the actual product description.
If they are just going to paste the keltec add on their page like that, they should at least read it and make sure its an accurate representation of the product they are selling. If its not, they should add a disclaimer saying so.