Editing M655 machine gun

{{Status|Canon}}
{{Weapon infobox
|image=[[File:H4 M655 HMG.jpg|300px]]
|manufacturer=
|series= 
|type= [[Wikipedia:Rotary cannon|Rotary]] [[machine gun]]
|cost=
|variant=
|service=[[Post-Covenant War conflicts]]
|affiliation= [[UNSC Armed Forces]]
|weight=
|length= 
|ammotype= 20mm{{Ref/Reuse|Guide}}{{Ref/Reuse|H4EVG}}
|capacity=
|feed=[[Wikipedia:Belt (firearms)|Belt-fed]]{{Ref/Reuse|H4}}
|operation= 
|rate=
|velocity=
|optics=
|range=
}}

The '''M655 Heavy Machine Gun/Anti-Matériel''' is a 20mm heavy machine gun used by the [[UNSC]].{{Ref/Site|Id=Guide|URL=https://www.halowaypoint.com/en-us/intel/inteldetail/aca271b6-022f-4889-9f68-7c234bb0b598/mantis-|Site=Halo Waypoint|Page=Halo 4 Interactive Guide - Vehicles: Mantis|D=01|M=05|Y=2013|LocalArchive=Halo 4 Interactive Guide#Vehicles}}{{Ref/Book|Id=H4EVG|H4EVG|Page=111}}{{Ref/Book|Id=Enc22|Enc22|Page=146}}

==Overview==
===Design details===
The M655 machine gun is a rotary autocannon employed by UNSC forces. The weapon boasts four barrels fed by two 20mm ammunition belts.{{Ref/Game|Id=H4|H4|M655 in-game model}}{{Ref/Reuse|Guide}}{{Ref/Reuse|H4EVG}} When firing, the weapon takes a few seconds to "spool up", with the fire rate increasing rapidly over the course of a few seconds.{{Ref/Reuse|H4}}

===Usage===
Some variants of the [[HRUNTING/YGGDRASIL Mark IX Mantis|Mark IX Mantis]] [[powered exoskeleton]] are armed with an M655 as well as an [[M5920 missile launcher]].{{Ref/Reuse|Guide}}{{Ref/Reuse|H4EVG}} Specially-upgraded [[ONI Mantis|Mantis variants]] employed by the [[Office of Naval Intelligence]] [[ONI Security|security forces]] employ an M655 upgraded with improved heat sink shrouds, allowing the weapon to fire for longer before overheating.{{Ref/Game|H5G|List of REQ cards|REQ card|Detail=[[ONI Mantis]] description|Quote=ONI Mantis units use multi-environment homing missiles and better heat sink shrouds for the heavy machine gun. Advanced Mantis with heavy armor and upgraded weapons.}} Mantises modified by [[Isabel]] for use by {{UNSCShip|Spirit of Fire}} forces in the [[Second Ark Conflict]] saw the M655's lower housing removed and replaced with a large drum magazine.{{Ref/Game|HW2|Phoenix Logs|Detail=Mantis}}

==Trivia==
In ''Halo 4'', the M655's barrels do not spin when the weapon is fired.

==Gallery==
<gallery>
File:H4 M655 front.jpg|The front of an M655 HMG/AM.
File:H4 M655_angle.jpg|A three-quarter view of the M655 HMG/AM.
File:HW2 Mantis.png|The Mantis design modified by Isabel, sporting an altered M655.
</gallery>

==List of appearances==
*''[[Halo 4]]'' {{1st}}
**''[[Spartan Ops]]''
*''[[Halo: Escalation]]''
*''[[Halo 5: Guardians]]''
*''[[Halo Wars 2]]''

==Sources==
{{Ref/Sources}}

{{UNSC heavy weapons}}
[[Category:Machine guns]]
[[Category:UNSC ground weapons]]