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A Magnetic Accelerator Cannon (or '''MAC Gun''') is a very large Coilgun in the Halo universe. The cannons fire metal slugs using a system of Magnetic Field s down a long shaft, increasing the projectiles' velocity until they carry an incredible amount of energy. The ship-based models use Ferric or Ferrous cores, while station-based versions use either Depleted Uranium or Ferric Tungsten rounds. They are the only non- Nuclear weapons that the UNSC possesses that can destroy Covenant shields. There are at least two versions of the orbital MAC platforms. The 20 Super MACs at Reach were designated Mark Vs and could launch 3000 metric ton rounds at four-tenths (40%) the Speed Of Light —that is, 120,000 km/s—giving a Kinetic Energy of 2.2 x 1022 Joule s or 1.6 x 1022 Foot-pounds Force . The Mk. V's could also reload in five seconds. MAC Cannons can also be mounted on ships, such as the destroyer ''Iroquois''. The cruiser ''. Shipborne MAC Cannons draw power from the ship's reactor and require a charge to be fired. Both versions generally require an AI to aim the cannon, as the slugs fired are unguided. Twenty MAC Cannons were used to defend the planet Reach from Covenant invasion, but they soon fell as the Covenant destroyed the underground generators that powered them. The planet Earth had 16, but production was stepped up quickly after above the city they are named for. In 's help. The Master Chief manually places the bomb in a nearby Covenant capital ship and detonates it. The explosion propels the Master Chief through space to land on the ''In Amber Clad'', Commander Miranda Keyes' ship. |
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