Any idea why their website doesn't even show models that came out 1-2 years ago?
Some (too many) companies simply don't put an emphasis on web sites. I know this because I work for a company that WAS like that.
When I started working for this company, the web sites were an after-thought. The marketing people would work on them when they had time. Problem was: They had no time.
When I started working on the web sites there, we had product on the sites that had been obsolete for a couple years, there were lots of new product that was not listed on the site, etc.
The company has now made a commitment to the web by promoting me into a newly-created position of 'webmaster' and the sites are now fresh, new, and up-to-date.
It's quite possible that Glock simply does not have the resources in place to keep the web site up-to-date. Once somebody there wakes up and realizes how much of an asset a great web site can be, perhaps they'll catch up!