This was an informative watch: https://youtu.be/qqhXsUwncfE

Basically, the tech isn’t there to power it, and also the “barrel” breaks down way faster than traditional guns

https://cdrsalamander.substack.com/p/waitwe-dont-have-to-give-up-on-the

https://cdrsalamander.substack.com/p/japan-is-wayne-e-meyern-railguns

I think rail guns and fusion reactors are in the same category: working on it, but we’re missing a specific piece of information.

Rail guns need a lot of power and the capacitors are slow to charge. Fix those issue and it’s probably viable. The US proved it was a powerful weapon that is accurate, and can be mounted on a ship. Problem is that the rate.of fire was minutes between shots, where current warfare says that if you don’t have an x/min fire rate, you dead.

Don’t understand fusion enough to say what’s the knowledge gap but again it’s one of those things that aren’t viable yet but we are close.