China built a ship mounted rail gun.
About 9 years ago, I had a debate with my then wife (a PhD DoD defense analyst) that the Chinese military would catch up with the Pentagon in my lifetime (meaning in the next 50 years). And she just laughed and said no way. Looks like I’m on track to be proven right.
http://www.newsweek.com/did-china-build-world-first-railgun-photos-look-powerful-electromagnetic-798313