Perhaps this sums it up:
https://www.ballisticmag.com/2018/05/23/glock-17-torture-test-ocean/
Glock 17 Survives 18-Year, 250,000-Round Torture Test Including 6 Months in Ocean
The method by which I proposed to “wring out” the Glock 17 was simple: I’d buy one at my local gun shop, then carry and shoot it in all kinds of weather and terrain conditions—in the heat, cold, rain, show, dust and mud. I’d shoot it and shoot it and shoot it, using every kind of ammo I could find, until it broke.
Moreover, in order to find exactly how tough the Tennifer finish actually was, I decided to present the pistol from a variety of holsters until the finish was virtually gone. I had to dry-practice mornings and evenings for a half-hour or 45 minutes anyway, so what better vehicle to get the answers I needed, right?
Eighteen years and 250,000 rounds later, after immersion in both fresh and salt water dozens of times; being tossed into the sand, dust, snow, mud and grit; being presented from a holster and fired constantly in temperatures ranging from sub-zero to over 100 degrees; and even being left on the bottom of the ocean for six months, my conclusion is that the test Glock 17 is without a doubt a heck of a pistol.
To summarize briefly, this pistol still:
- Produced Ransom Rest 3-shot groups of just more than an inch at 25 meters with most factory ammo or handloads, including a wide variety of JHP and JSP bullet types.
- Exhibited minimal finish wear. Even after just more than one million holster presentations, it showed a bit of brightness only on the square edges of the slide and a couple of points near the grasping grooves.
- Hadn’t rusted to any significant degree, though it had repeatedly been exposed to all kind of salt- and fresh-water moisture.
- Continued to demonstrate virtually flawless mechanical reliability, despite being seriously abused and digesting a full 250,000 rounds. I didn’t even have to replace the original extractor until just over the 250,000-round mark. And it still used the original recoil spring and guide without a problem.
- Hadn’t suffered any kind of catastrophic failure of the slide or frame. Though a small piece of polycarbonate at the edge of the magazine well broke off during a particularly vigorous speed-load some years back, the gun’s function remained flawless.
- Outlasted no less than a dozen magazines, even though I make it a point to disassemble and clean them every two or three times they’re used.
Then there was the scenario when I installed Glock’s underwater kit and fired the weapon without a single stoppage while fully submerged. Have you ever done standard exercises from the holster at 3, 5 and 7 meters or multiple target drills while standing on the ocean floor 30 feet below the surface? As a sidenote, the reason I didn’t shoot past 7 meters was because the water quickly decelerated my bullets. Accuracy began to deteriorate excessively past that range.
I then left the pistol on the ocean floor for a full six months, recovering it on my next trip to the area. Subsequent examination showed only minor—almost microscopic—pitting on the slide lock lever and a small, oddly shaped pit on the left-hand upper corner of the slide just forward of the grasping grooves. Nothing else rusted—not even the internal surface of the bore.
Another G17 adventure I remember with fondness was when I took it to Alaska to see how it performed in sub-zero temperatures. On the day of the test, it was 40 degrees below zero in Kenai, Alaska. The camera had to be rushed into a special warm-up shed between frames to prevent the motor-drive and light-meter batteries from dying. Yet, the test Glock went through the entire 750-round test without a single stoppage.
Not impressed? Well, perhaps you’ll reconsider when I tell you the test format. It consisted of rapidly shooting the pistol until it was empty, quickly inserting a fresh magazine, then dropping it into the snow and leaving it there for 20 minutes. I then retrieved the pistol and attempted to fire. Now are you impressed? I certainly was.
I also buried the test gun in a sandy Arizona dry streambed, then recovered it and fired it without difficulty. Then, as if that weren’t enough, I tossed it into a running creek and duplicated the exercise. Still no malfunctions.
My take: The 9mm Glock is the SHIZZLE.