Duke of Doubt, that 'thing' in the photo of the Glock 17 is a FAB Defense rail attachment. It takes the place of the magazine's factory baseplate so it'll attach to accessory rail of gun and make like a foregrip, super fast magazine changes too.
Don't think they're ATF approved for your...
About Glocks blowing up more than any other pistol; an aftermarket barrel like this here's with a fully supported chamber and land and groove rifling would iron out any doubt.
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