I'd be suspicious of it. Remember the fake car-bomb detectors?
I'd imagine a jammer gun to more resemble a small bazooka or even a parabolic dish on a stick, or both. Maybe it's the guts of a microwave oven?
(, Tue 7 Jun 2022, 15:12, Reply)
(, Tue 7 Jun 2022, 20:46, Reply)
Which is what caused me to think of EMP. The antenna can be coiled up inside the case.
(, Tue 7 Jun 2022, 21:31, Reply)
If it is, as I suspect, the guts of a cheap microwave oven connected to a powerful battery, you'd definitely want something to point the carcinogenic radiation away from the operator. A mirrored/steel funnel, Pringles tube, or something.
(, Wed 8 Jun 2022, 14:40, Reply)