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I customize Glocks for this reason:
A base Glock plain works. I want to start with a platform that's durable and has a solid track record. Unfortunately, ergonomically it's similar to a brick. However, that can be fixed.
I own 3 Glocks. Glock 1 is carried on duty and I can't modify it, so it's my least favorite to shoot, but it works. Glock 2 is a 19 with shaved fingerbumps, double undercut trigger guard, an OP DAT trigger, a SF x300u, and a set of Trij HD's. This gun is a lot more fun to shoot. It fits my hand much better, and it does what I need it to do. The reliability hasn't been compromised in anyway either.
Glock 3 is a Roland Special. It's flat shooting, accurate, concealable, and a true pleasure to shoot.
My overall point being is that people modify Glocks because the base platform is relatively cheap and they're reliable. They're just boring and with some minor mods, you can make them into seriously awesome shooters.
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I think basically this.
Just like the AR, you pick a basic, common, reliable, and common weapon and make it work better for you.
People have been customizing weapons since weapons were a thing. 1911 mods have been done so many times that there are "standard modifications" now expected on any semi-custom (or higher grade) gun (larger beaver tail, improved hammer, enlarged ejection port, sights).
The Glock makes sense in this light as they are popular, easily obtained at any gun store, reliable, and cheap. They have a large aftermarket that is capable of supporting many companies putting $ into developing stuff for them (market share is important here......if only 400 people in the nation have a gun, there's not nearly as much profit as if there is 100k people who own a particular make & model).
I have been using Glocks for years and I've done very little to them. New sights is the only mod that I've done to most all of them. I have a 19L that I like a lot. I have GFAs on 2 and skateboard tape on a 34. I don't really call weapon lights as customization, but they are another standard addition.
I'd like to roland special my G19 & 19L.....probably the next thing that I do.