Castor naval coilgun

The Castor naval coilgun is a large naval autocannon used by the Colonial Military Authority and United Nations Space Command. It is capable of being loaded with a variety of specialized ammunition, including experimental shield-piercing shells.

Mark 40 Castor
The Mark 40 Castor naval coilgun is employed on the UNSC and CMA Navy's. Two such cannons are employed by the corvette.

Mark 55 Castor
The Mark 55 Castor naval coilgun is employed on the UNSC Navy's. Five such cannons are equipped on the Strident, three of which are paired with two Mark 57 Arena point defense guns in a 'quickshot' configuration.

List of appearances

 * Halo 4
 * Spartan Ops
 * Halo: Escalation
 * Halo 2 Anniversary
 * Halo 5: Guardians