Swivel gun

The swivel gun is a very powerful ship item found under the Miscellaneous tab which can fire upon enemy ships, firing relatively quickly and doing low AoE damage.

To use the swivel gun, you must have a pirate with "cannons" enabled in the crew menu and with the "Cannon Mastery" skill. In addition, you must have at least one bomb placed somewhere on your ship for the pirate to carry to and load into the gun.