If you shoot it enough, use it enough, it will break. I have found the 9mm Glock pistols to have exceptional reliability and longevity. I have heard of full-frame 9mm Glocks going 100k rounds without a single parts breakage. Well, even so, eventually, they break. The good news is that modern, poly-frame guns like the Glock, tend to be very easy to fix. It is rather rare for a major component (slide, barrel, or frame) to go on a Glock unless faulty ammunition or abuse is involved, thus, most breakdowns involve small internal components.
Even though there are now a variety of Glock-alike guns out there that have, arguably, better and more modern features and ergonomics, I have stuck with Glock as my primary pistol platform, and one of the main reasons for that is after-market and spare parts support. The Glock is the AR15 of pistols in terms of aftermarket customization and simple availability of parts. This is important. I don’t like having to send a gun back to the factory to get repaired.
Recently, my primary training Glock 19 broke its extractor. This gun has, roughly, 40 thousand rounds through it in over a decade of use. Nothing has been replaced until now, save for the replacement of recoil springs every 4-5 thousand rounds. So, at about 40 thousand rounds, the extractor broke. Everything else is working fine. But, it did not make it to 100k rounds without a single parts breakage, that is for sure.
However, the gun has far more use than just the 40k rounds down range. I dry fire the s@#t out of it every week, I have bashed the hell out of it in training classes, both taken and taught, and I can’t even imagine how many times I have demoed “failure to extract” malfunction clearances with it. Do you suppose that it hard on the extractor? I would say so.
So, if you use it, it will break. The good news, it takes five minutes to drop a new extractor into a Glock 19. Keep an extra on hand for every single part in your primary pistol platform.
This also illustrates why I am a believer in having a separate training gun and carry gun. Eventually, if being shot a lot, it breaks. Therefore, I like to put the rounds through a dedicated training gun and keep the carry gun to a fairly minimal round count.
Live fire practice is essential. To buy the ammo that I use for training at the best possible price, go to:
https://www.ammoman.com/9mm-luger-federal-champion-115-grain-fmj-wm5199-1000-rounds
Reflex Handgun 
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