Your gun didn't and cannot set them off.
I respectfully disagree. As I said, I believe it is well within the realm of possbility. Maybe it
doesn't happen, but this does not mean it
can't happen.
The inventory chips are detuned when they are demagnetized. In fact, you don't even need a coil.
I discovered a thin ferrous wire in the backing of a library book once. Magnetized it, went into the library, set off the alarm, got waved in.
Picked some books up, slipped the wire into one of them (so there were two wires in the book) and when both went over the demagger at the checkout counter, it was also demagged, and I therefore exited with no alarm.
Chances are
best that it was something else that set off OP's alarm, but it is not impossible that it was his gun.
Not that familiar with Glocks, but if it's striker-fired, the firing pin spring (and of course the recoil spring) is probably shielded by the slide, and the mag spring would probably be shielded by the mag itself. But not impossible.
The last time we went through this (on PDO?) there were two camps (as there will be here). Those who said it never happened to them, and it was therefore impossible, and those who recognized that springs (and even straight wires) have self-resonant characteristics which might fall in the sensing frequencies of the tag detectors.
As I mentioned, I am well aware that such is a possibility, and don't feel a need to prove it. Which is why I never bothered to unlimber my GDO (Grid-Dip Oscillator, a device designed to determine resonant frequencies) to check it out. There are so many variables involved which would affect a spring's tuning, including the size of wire in the spring, its diameter and length, whether it's compressed or not, whether it happens to have a little residual magnetism picked up from somewhere, etc, etc, that it is not likely that any
particular gun will happen to have its springs juuuust right to set off an inventory control detector.
Therefore, negative attempts to set off an inventory detector with a particular gun mean nothing.
DE wd0xxx
A grid-dip oscillator: