Point-defense cannon

A point-defense cannon, abbreviated PDC, is a starship-mounted weapon used by the UNSCDF. Though several models exist, the most common type of point-defense gun fires 30x170mm AP-HE projectiles.
== Overview ==
PDCs are turreted rotary autocannons that are used by UNSC ships to intercept incoming ordinance. They are laid out on a ship's hull to cover all angles with overlapping fields of fire to more easily and effectively destroy missiles and hostile smallcraft.
PDCs are either computer-controlled, or operated by a ship's Artificial Intelligence, as human gunners lack the reaction times necessary to effectively track and destroy fast targets like missiles. Human gunners do, however, select targets for the guns. The cannon turrets can also be retracted into the hull when not in use to protect them from damage.
== Known models ==
=== M129 Avenger ===
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=== M133 Equalizer ===
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=== M134 Thunderbolt ===
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=== M620 Buttress ===
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=== M710 Bulwark ===
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=== M965 Fortress ===
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=== M606 Goalkeeper ===
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=== M810 Helix ===
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=== M910 Rampart ===
Produced: 2547–present
In service: 2549–present
Used by:	
* UNSC Air Force 
* UNSC Navy
*UNSC Naval Surface Warfare Command
Designer: General Electric
Manufacturer:
* General Electric
* General Dynamics
Length:
* 19 ft 10.5 in (6.06 m) (total system)
* 112.28 in (2.85 m) (gun only)
Barrel length: 90.5 in (2.30 m)
Ammunition: 30x170mm
Barrels: 7
Rate of fire: 4,000-6,000 rpm (variable)
Feed system: linked belt
Category:Daisy-023