The Chief Instructor from OPD, retired, went to work at the Kennedy Space Center (they have their own Police?) Anyway he went to the Plus 2 Extensions for their issue Glock 17s.
Having issues with this item, I informed him of them. They had a very nice shoot house, shooting a drill with long guns, ARs? An Officer bashed his holstered pistol!
He now had a single shot pistol, that he had a heck of a time removing the magazine body from.
All scrapped. If you carry a Glock 19, as I do, my spare magazine is a G17 one. Absolute reliability is worth way more in the long run.