You can get 320x240 60hz for $2000 as a consumer[1]. On the one hand I wonder what kind of resolution the military grade version is, but I also wonder if the bandwidth/dollar is actually better. I imagine Raytheon basically just makes up a number when they're setting the price of a helicopter gun cam.

[1]: eg https://www.amazon.com/FLIR-Systems-III-320-Thermal-Detector...