The railgun is way behind schedule. It was supposed to be the main weapon for the DDX and the CGX which I believe was canceled.
It was just tested a few months ago and it took out a bunker buried 200 feet underground from over 100 miles away. Behind schedule or not, that is pretty awesome. The Navy is now making the decision on which platform to mount the first one. Zumwalt is DDX just FYI, and due to it’s expense only 3 will be built, at least as of now. 1000 is in the water under test, 1001 is next tot he pier and 1002 is still being constructed and is on the rails.
Actually, the first rail gun was planned to be tested at sea to sea this year. It will be tested at sea on one of the new Joint High Speed Transport ships being set up specially as a test bed for it.
This may still occur, but an alternate plan was announced in March to forego that testing and put the 1st gun on the 3rd Zumwalt vessel, The Lyndon Baines Johnson, currently under construction and set to launch in 2017.
Not sure which they will do at this point...final decision not made.
We shall see.
But it is definitely well tested and coming close to being available.
I expect we will see what deployed to sea in the 2020 time frame.