What's wrong with Gatling guns? An oversized radar-directed shotgun would probably work too.
Very short range - and we took them off of most our ships because we decided SeaRAM was better, even though the ship can only fire 8-12 of them per launcher and then it has to go back to port to reload. The Navy has been hastily putting them back on in some cases, but a lot of them got scrapped, there’s a production backlog and new production ships didn’t have provision for the mounts the old ones of the same model did.