| abstract | - The Psycannon is a weapon exclusively used by the agents of the Ordo Malleus of the Inquisition and its Chamber Militant, the Grey Knights Chapter of Space Marines. There are a few notable exceptions to this general rule, such as the Inquisitor Gideon Ravenor of the Ordo Xenos, whose armoured grav chair was fitted with a pair of such weapons. The Psycannon is generally wielded with both hands by the Grey Knights who are assisted in making use of it through the efforts of their Power Armour. It is used with two hands by most other operators as well, although members of the Grey Knights' Terminator Squads mount the Psycannons on their arm instead. The method of feeding ammunition is similar to that of the Heavy Bolter used by the Space Marines, which uses an ammunition belt running from the ammunition store located within the operators' armoured backpack. The Psycannon can also be used in conjunction with a device called a Mind Impulse Unit. The Psycannon is linked to the mind of the user and is fired by his or her mental volition. This has the advantage of allowing the user to fire the weapon while keeping both hands free, and allowing the user a greater intimacy with his weapon's internal workings, such as its current amount of remaining ammunition or its barrel temperature. Also, if the user is a psyker, they can infuse their own power into the weapon, adding to its already devastating effect. This is a common technique used by the Grey Knights, the only Astartes Chapter comprised entirely of psykers. High-ranking members of the Ordo Malleus may use Bolt Pistols and standard Bolters which fire down-sized versions of the Psycannon's ammuntion. These Psycannon bolt rounds are less effective than the standard Psycannon's bolts, but more powerful than the same-sized bolts of a non-psychically charged weapon.
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