from what I've heard, the 'guns' are just signal jammers
That's also ignoring the fact that if the signal to a drone is lost, it's more than likely to fall out of the sky like a ton of bricks.
Consumer drones typically have well-defined and behaved signal loss behavior, which (for DJI ones at least) is even fairly configurable. Though quite often that behavior involves gaining a substantial amount of altitude (at least by default), which at an airport is actually probably worse than dropping.
[1] https://www.electronics-notes.com/images/antenna-yagi-radiat...