Marko Kloos
Moderator Emeritus
Glock 17 <...> is invisible to X-rays and metal detectors.
Glocks are visible just fine on x-rays, and they will set off metal detectors as well. Over 80% of a Glock's mass is old-fashioned steel.
(Even if it was made totally out of Riboflavin, the cartridges are still ferrous, anyway.)