http://i8.photobucket.com/albums/a28...ife/biggun.jpg

It's called a CIWS. It's a big computer controlled chaingun.

http://i8.photobucket.com/albums/a28.../bigbullet.jpg

And a bullet for said gun.

http://i8.photobucket.com/albums/a28.../untitled1.jpg

http://i8.photobucket.com/albums/a28...ife/Sesshy.jpg