Right now, Glock Model 19's are selling as fast as they hit the shelves. To my knowledge this has been going on since, at least, the end of January 2011. Opinions vary as to the reason, 'Why?'
In a published newspaper article, the owner of a large Glock distributorship is quoted as saying words to the effect, 'I expected this.' (I don't know? Perhaps he's less ingenuous than I am, or maybe psychic!)
The same thing has been happening with many ultra high capacity Glock pistol magazines; but this one seems to be easier to figure out. Recent sales of 33 round magazines are, probably, being driven by fear of an impending congressional ban. Personally, I doubt it; and I expect the current hysteria to pass.