All technologies have military and civilian use. Just because you can’t think of a civilian application for precision gyroscope doesn’t mean others can’t. Precision surveying immediately comes to mind as a potential application, plus civilian inertial navigation devices.

And no, there is not some magical level of precision that only the military has use for. If something has military applications, it also has civilian ones. Hell, there are potential peaceful applications of nuclear bombs. If those can be a dual-use technology, anything can be.