I grew up playing Counter-Strike and have in the past few years bought a few guns; despite their solid reputation and the fact that they do what I want, I never even considered a Glock. Was this causal? Who knows, but I wouldn't rule it out.

Given how effective advertising is, I think it's safer to assume that such a relationship does exist for some.

We're all subject to a wide variety of unconscious biases.

I assume that a gamer would want a Heckler & Koch VP9 just for the appearance.

Well, there was a noticeable surge of new Mini14 owners at my local range during the peak of PUBG (Player Unknown's Battlegrounds) battle royale game.

Glock does kind of have a reputation as a low-end plastic Walmart gun. I doubt Counter-Strike is causing that reputation, but it certainly isn't helping

It also has a reputation of being one of the most reliable, simplistic and easy to use/maintain guns used by military and law enforcement around the world. So much so that other highly reliable Striker Fire handguns all basically cloned the Glock design (Smith & Wesson's M&P line, among others).

I'd bet there's influence coming from both ends - those who used them in video games and decided their first gun just couldn't possibly be a Glock, and those who see Special Operations guys using them and decided their first gun just had to be a Glock.

Yea I was gonna say, most real gun owners understand that reliability, recognizability and using ammo that's very common and available trump anything else. Glock 9mm is always a good choice.