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==General Information==
Autocannons have large calibres,{{Fn|25}} ranging from 25mm{{Fn|26}} to 30mm,{{Fn|23}} up to 50mm,{{Fn|24a}} 55mm{{Fn|24c}} or even 105mm.{{Fn|24b}} They are usually either mounted on weapon carriages or vehicles because of their great weight.{{Fn|1}}
Due to their high rate of fire and sufficient killing power, they are effective against large infantry formations and light armored vehicles.{{Fn|3}}, which makes them ideal for use against large [[Tyranid]] organisms and [[Ork]]ish vehicles.{{Fn|4}} They are also useful against heavy infantry such as [[Space Marines]], although Marines' [[power armour]] has been known to stop autocannon rounds.{{Fn|5}}
Autocannons are used by the [[Imperial Guard]], [[Space Marines]], [[Witch Hunters]], and [[Chaos Space Marines]]. Orks, in particular, enjoy using autocannons because of the prodigious noise and recoil produced by firing them.{{Fn|2}} Other autocannon users include [[PDF|planetary militias]] and [[The Lost and the Damned|traitor armies]].{{Fn|25}}
==Known Patterns==
*'''Ironhail Pattern''' - Used on [[Invictor Tactical Warsuit]]s{{Fn|14}}
*'''Kalibrax Pattern''' Autocannon - Used extensively during the Great Crusade by the Astartes.{{Fn|10}}
*'''M34 Autocannon''' — The M34 Autocannon is an older version of a common pattern fielded by [[Imperial Guard]] forces all over the [[Calixis sector]]. Used with a tripod mount, this version is designed to be operated by two persons, though it can be operated by a single gunner if necessary.{{Fn|25}}
*'''Magna-Coil Autocannon''' - Used by [[Leagues of Votann]] [[Magna-Coil Bike]]s.{{Fn|18}}
*[[MATR Autocannon]] - Used by the [[Leagues of Votann]]
*{{Endn|21}}: [[The Sabbat Worlds Crusade (Background Book)]] (2nd Edition), pg. 120
*{{Endn|22}}: [[Liber Astartes]], pg. 128
*{{Endn|23}}: [[Gunheads (Novel)]] — [[Hammer of the Emperor (Omnibus)]], Chapter Five
*24: [[Emperor's Mercy (Novel)]]:
**{{Endn|24a}}: Prologue
**{{Endn|24b}}: Chapter Eighteen
**{{Endn|24c}}: Chapter Twenty-Six
*{{Endn|25}}: [[Rogue Trader: Faith and Coin]], pg. 82
*{{Endn|26}}: [[Flesh and Iron (Novel)]], Chapter Seventeen
===Uncited===
