I don't know why Glock resisted making threaded barrels for so long but they are making them now. I'm looking forward to finding out if we can get these factory installed.
What leads you to believe that they are making them available now? I wish they would make them available, but the unfortunate reality is that people have been discussing this issue, and the related issue of whether GLOCK will make just regular non-threaded barrels for the 19/23/32 available (the way HK, Steyr, SIG, Beretta, Kimber, S&W and others have) for the Canadian market, for as long as I can remember. The talk goes on forever but we never actually see this in Canada.
If we start seeing threaded barrels readily available in the U.S. , I think only then will we start to see them in Canada. I think GLOCK has made their position abundantly clear over the years that, unlike those other companies I mentioned, they will do NOTHING to make their compact models available to Canadians, and will in fact take steps to stop or hinder those trying to sell their compact guns in Canada (i.e. the "Questar letter").
If you look at Top Gun Supply, one of the bigger sellers of GLOCK pistols online in the U.S., they have on their website a full line of GLOCK pistols and a full line of GLOCK barrels, most of which are listed as "in stock" and "ready to ship", and yet there isn't a single threaded barrel among them.
http://www.topgunsupply.com/factory-glock-barrels/
http://www.topgunsupply.com/glock-handguns/
I wouldn't hold my breath for threaded barrel GLOCK 19's showing up at your local gun store any time soon - probably ever. But, as I say, I wish they would - because I would buy them as well.
EDIT - O.k., I did a search. This is what you are talking about and where you got your pictures from?
http://www.aacblog.com/?p=9558
Perhaps some of the Canadian distributors can contact this company... AcuSport (which I have never heard of) and see if they are for real and whether they actually have GLOCK factory barrels for sale. If somebody can get them... the barrels, or the guns with the barrels already in them, or whatever... they will sell lots of them. But as I say, people have been talking about this forever....