>>63907546
No, because it runs into the Ornithopter Fallacy. The Ornithopter, an aircraft which produced lift via the movement of its wings, raises multiple mechanical and engineering challenges:
1. You have to design a wing that is able to produce lift by flapping and not snap while doing so
2. You have to design engines and motors that are able to maneuver said wings effeciently and precicely enough that they can fly the aircraft effectively for long enough to warrant their use.
3. By the time you have developed both the above, these technologies would be better served in regular, traditional aircraft like helicopters and jets.

By the time you create a barrel that can survive regular use in a railgun, you can just switch them to a regular ship's gun. By the time you create a power-system that can fire the railgun, it is better suited to be used doing anything else. By the time this technology can be used to power man-sized railgun weaponry, they're going to use them in some other, more effective capacity.