Not very quickly.
China’s Deadly Naval Railgun Is Out for Sea Trials. Can America Match It?
Space and power limitations have stymied the U.S. Navy’s own railgun development, which began in earnest in 2005. In 2012, the Navy began land-based testing of two prototype railguns.
The Chinese navy apparently has sent a high-tech electromagnetic gun to sea for tests.
(This first appeared last year.)
In December 2018, a photo appeared on the Chinese internet depicting