Tarantula Sentry Gun - Variants: There are several different variants of the Tarantula Sentry Gun in use by the Astra Militarum and the Adeptus Astartes. All of the known variants include:Spearhead Sentry Gun - Spearhead Sentry Guns are a somewhat smaller variant of the Tarantula Sentry Gun and are used during starship boarding actions. These Sentry Turrets are extremely effective due to the tight corridors and passageways on many Imperial starships. Spearhead Sentry Guns are used both by the spearhead forces of attacking boarding parties and by starship defenders. These Sentry Guns are used by both Imperial Guard and Imperial Navy boarding parties and by the Adeptus Astartes. The Spearhead Sentry Gun has a wide selection of weapons that can be used as its load-out, the most common being a set of twin-linked Heavy Bolters or Heavy Flamers. It can also be armed with either a single Missile Launcher or an Assault Cannon. Boarding parties or defenders expecting to deal with heavy infantry or even light vehicles, which may be encountered during assaults on cargo bays and vehicle holds, may also arm their Sentry Guns with twin-linked Lascannons, twin-linked Plasma Cannons, or Quad Heavy Stubbers. Spearhead Sentry Guns can make use of the Point Defence and Sentry firing modes.Tarantula Sentry Gun Emplacement - A Tarantula Sentry Gun can also be made part of a Turret Emplacement, replacing the crew-operated turret weapon with an automated Tarantula Sentry Gun. An emplaced Sentry Gun is less susceptible to enemy fire and has access to larger amounts of power and ammunition in performing its duties.Hyperios Air Defence Platform - The Hyperios Air Defence Platform is a variant of the Tarantula Sentry Gun that is armed with a set of twin-linked Hyperios Missile Launchers. This variant of the Tarantula is used by Space Marine Chapters as a static emplacement to defend important strategic locations from enemy aircraft due to the Space Marines' notable lack of available anti-air vehicles. Space Marine Chapters value the Hyperios Air Defence Platform as it allows them to defend important locations and positions without tying up valuable Space Marines as a gun crew or forcing a Whirlwind artillery tank armed with a Hyperios Missile Launcher to stay in one place to act as a static defence. A battery of Hyperios Air Defence Platforms is able to quickly clear the skies of hostile aircraft, usually acquiring and firing a salvo of missiles before most human gunners can even find their target.Hyperios Command Platform - The Hyperios Command Platform is a variant of the Tarantula Sentry Gun that replaces its standard weaponry with an advanced tracking Auspex and command relay system. This variant can be used in conjunction with the Hyperios Air Defence Platform, usually as part of a battery, and gives any Hyperios Air Defence Platforms tethered to it higher degrees of accuracy against enemy aircraft.Teleportation Array - A Teleportation Array is a variant of the Tarantula Sentry Gun in which the Tarantula's weapons are replaced with a Teleport Homer. This variant can be set up in the field by Space Marines and used to call in additional reinforcements from orbital starships via teleportation. These devices allow for a much higher degree of accuracy and safety for the troops being teleported.