MK-15 Phalanx Categories Machine Guns Navy Equipment Navy Weapons Weapons Manufacturer: Raytheon Rate of Fire: 4,500 rpm Magazine Capacity: 1,550 rounds Caliber: 20mm. Ammunition: Armor Piercing Discarding Sabot Type: M-61A1 Gatling Gun The MK-15 Phalanx CIWS provides ships of the U.S. ...