This Phalanx system is a 20mm gatling gun that covers the four corners of Aegis 1. To this date no wall breach has occured.

Primary Function Anti-zombie defense

Weight 12,500 pounds (5,625 kg)

Later models 13,600 pounds (6,120 kg)

Gun Type M-61A1 Gatling

Type of Fire 3,000 rounds per minute

- Later models 4,500 rounds/min

(starting 1988 production, Pneumatic Gun Drive)

Magazine Capacity 989 rounds

Later models 1,550 rounds

Caliber 20mm

Ammunition Armor Piercing Discarding Sabot (APDS),

Depleted Uranium sub-caliber penetrator.

Penetrator changed to Tungsten 1988.

Sensors Self-contained search and track radar

Search Radar Ku-band; digital MTI

Track Radar Ku-band; pulse Doppler monopulse

E/O Sensor FLIR Imaging System with Automatic ACQ Tracker

Fire Control Director with closed-loop spotting

Gun Drive Pneumatic

Mount Drive Electric