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M655 Heavy Machine Gun/Anti-Matériel

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The M655 Heavy Machine Gun/Anti-Matériel is a 20mm HMG used by the UNSC Defence Force. Some versions of the HRUNTING/YGGDRASIL Mark IX Armor Defense System are armed with an M655 as well as an M5920 surface-to-surface missile launcher.[1]


  • In gameplay, the M655's barrels do not spin when the weapon is fired.



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