Editing Orion

{{otheruses|the 75-ton BattleMech|other uses|Orion (disambiguation)}}
{{InfoBoxBattleMech
|image = Orion RGilClan v19.png
|name = ''Orion''
|manufacturer = 
[[Diplass BattleMechs]]<ref name = "FR2765:Pp11">''Field Report 2765: Periphery'', p. 11: "Infrastructural Integrity"</ref>
----
[[Kali Yama Weapons Industries]]<ref name=TRSWp144f>''Technical Readout: Succession Wars'', pp. 144–145: "ON1-K Orion"</ref> <!-- reprinted from TRO:3039 -->
----
[[Kali Yama/Alphard Trading Corp.]]<ref name=TRSWp144f />
|model = ON1-K<ref name=TRSWp144f />
|class = Heavy
|production year = 2525
|year reference = <ref>''Era Digest: Age of War'', p. 11</ref>
|cost = 6,674,500 C-bills
|Tech Base = Inner Sphere
|mech type = BattleMech
|mass = 75
|chassis = [[KaliYama Chassis]] <!-- <ref name=TRSWp144f /> -->
|armor = [[Valiant Lamellor]] <!-- <ref name=TRSWp144f /> -->
|engine = [[Vlar 300]] <!-- <ref name=TRSWp144f /> -->
|comsys = [[Irian Orator-5K]] <!-- <ref name=TRSWp144f /> -->
|T&T = [[Wasat Aggressor Type 5]] <!-- <ref name=TRSWp144f /> -->
|heat sinks = 10 [[Heat Sink|single]] <!-- <ref name=TRSWp144f /> -->
|speed = 64 <!-- <ref name=TRSWp144f /> -->
|armament = <!-- <ref name=TRSWp144f /> -->
* 1x [[autocannon/10]]
* 1x [[LRM-15]]
* 2x [[medium laser]]
* 1x [[SRM-4]]
|BV (1.0) = 1,069<ref>''Combat Operations'', p. 107</ref>
|BV (2.0) = 1,429<ref name=TRSWp144f /><ref>''Record Sheets: 3039'', p. 160</ref>
}}

==Quote==
{{Quote|A poor man's ''[[Atlas (BattleMech)|Atlas]]''<ref name = TRO3039>''Technical Readout: 3039'', pp. 152–153</ref>}}

==Description==
The '''''Orion''''' was built in [[Introduction Year::2456]] as the first true heavy [[BattleMech]]. Originally designed for the [[Terran Hegemony]] to maintain its dominance and built on [[Hesperus II]],{{cn}} the ''Orion'' is a dependable workhorse design that can handle almost any combat role, thanks to its mix of long and short-range weaponry and its respectable armoring. After the K model was introduced in [[2525]], the 'Mech first saw combat during the [[Reunification War]] and continued to serve the [[Star League]] and its Member States for the next few centuries. Perhaps its most famous role was as the personal 'Mech of [[Aleksandr Kerensky]] during the [[Amaris Civil War]], and it was while piloting his ''Orion'' that the general kicked down the palace doors to take [[Stefan Amaris|the Usurper]] prisoner.<ref name=TRO3039/><ref name=TRO3025r>''Technical Readout: 3025 Revised'', pp. 100–101</ref>

The inspiration for the ''Orion''<nowiki>'</nowiki>s beginnings is said to be a direct result of [[Operation PROMETHEUS]] when the Terran Hegemony realized they would no longer be the sole user of BattleMechs. Work began shortly after with the [[Hegemony Armed Forces]] requesting machines suited for various combat roles, and the Hegemony's military leadership were soon accepting proposals for competing designs almost simultaneously. With other designs already underway, it would be [[General Mechanics]] winning a contract for a proposal that would ultimately become the Hegemony's premier heavy attack BattleMech: the ''Orion''. Ironically, GM had actually unveiled a prototype as early as [[2453]], but the HAF, while interested at the time, were dismissive as it did not meet the High Command's requirements for speed and armor, and its armament was considered too lackluster for a front-line war machine. GM had returned to the drawing board in the following years, further refining their design by settling for a smaller, less powerful engine to free up weight for additional weaponry. It would not be until GM's third prototype—the ON1-H, which mounted a newly developed class-10 heavy autocannon—that the HAF would finally approve the design one year following Operation PROMETHEUS in 2456. Following the successful introduction of the prototype, the HAF immediately pushed General Mechanics to produce as many ''Orion''s as possible. The armed forces of the Hegemony quickly assigned them to BattleMech regiments in whole companies at a time, adding to their growing ranks of ''[[Mackie|Mackies]]'', ''[[Banshee (BattleMech)|Banshees]]'', and later ''[[Archer|Archers]]'' and ''[[Griffin|Griffins]]''.<ref name=XTROPv5>''Experimental Technical Readout: Primitives, Volume 5'', p. 7: "ON1-H ''Orion'' 'Mech Profile"</ref>

After the fall of the Star League, [[Kali Yama Weapons Industries]] took over production of the ''Orion'', building new models from their factories on [[Kalidasa]]. This left the [[Free Worlds League]] as the only producer of new ''Orion''s during the [[Succession Wars (History)|Succession Wars]], although the other [[Successor States]] were capable of building spare parts to repair their 'Mechs, and meant the [[Free Worlds League Military]] was the largest ''Orion'' user. When Kali Yama merged to create the [[Kali Yama - Alphard Trading Corporation]], ''Orion'' production was started up on [[Kendall]] as well.<ref name=TRO3039/><ref name=TRO3025r/>  The League's dominance in new ''Orion''s began to change during the [[Clan Invasion]] when the Successor States met on [[Outreach]] and agreed to work together to combat the [[Clans]].  Kali Yama/ATC was among those companies which agreed to sell war matériel, including the ''Orion'', to the other States undergoing Clan attacks. In spite of the design's age it still finds itself utilized extensively on the modern battlefield and new variants continue to be produced.<ref name=TRO3050u>''Technical Readout: 3050 Upgrade'', pp. 82–83</ref>

==Weapons and Equipment==
The ''Orion'' has a varied weapons mix.  The 'Mech's primary long-range weapon is a KaliYama Death Bloom LRM-15 launcher mounted in the left torso along with two tons of reloads.  While an accurate weapon useful against both land and air targets the system's control cables travel through a narrow area in the shoulder.  This area is potentially subject to excessive heat, which can cause either the weapon or actuator to shut down. For intermediate ranges, the ''Orion'' carries a KaliYama Class 10 Autocannon/10 in its right torso with two tons of ammo.  For centuries the ammunition feed to the cannon suffered regular jamming unless pilots loaded nineteen salvos instead of the full twenty in the ammunition magazine.  This defect was eventually solved in the 3030s by [[Norse-Storm BattleMechs]], although the fact that the weapon's placement limits right-arm movement and can be knocked out of alignment if accidentally struck couldn't be helped.  Finally, for close-range combat, the ''Orion'' has an Irian Weapons Works Class 4 SRM-4 launcher in the left torso fed by a one-ton bin of ammo and two Irian Weapons Works [[medium laser]]s; one in each arm.<ref name=TRO3039/><ref name=TRSWp144f />


Carrying fourteen and a half tons of armor gives the ''Orion'' superior protection to most other [[heavy 'Mech]]s, with its chest and rear torso being the most and least protected respectively.  Combined with an average cruising speed of 43.2 km/h the 'Mech is a challenging opponent.  Only ten [[heat sinks]] mounted in the engine leaves the ''Orion'' vulnerable to overheating but experienced pilots know to avoid this issue by alternating weapon firings.  Technicians love the ''Orion'', because its spacious interior makes performing repairs and maintenance far easier than many other 'Mechs; this is also the reason for the design's longevity.<ref name=TRO3039/><ref name=TRO3025r/>

===Original Configuration===
When first introduced in ''[[Technical Readout: 3025]]'', the ON-1K ''Orion'' was given conflicting data. It was described in the text to carry 25 salvos ("rounds") for the SRM-4 launcher, mounted in the left arm, and feature 14.5 tons of armor which gives maximum armor cover on its frame (231 points, with the 232nd armor point allowed from 14.5 tons of armor going unused). However, at the same time its stat block described the SRM-4 launcher as left torso mounted and gave it 1.5 tons of SRM ammunition for a total of 37 salvos, and (only) 14 tons of armor, with altogether 7 less armor points, 224 versus 231, over the accepted configuration. Specifically, each arm was given 21 instead of 24 armor points and the rear center torso armor was given 9 instead of 10 points. A [[record sheet]] for this earlier version of the ON-1K with 224 armor points and 37 salvos of SRM-4 ammo was published in the record sheets booklet in the 1987 ''[[BattleTech Reinforcements]]'' boxed set. Notably, rules at the time did not allow for SRM ammunition to be allotted in anything but 1-ton increments so the design with 1.5 tons of SRM ammunition was illegal under the construction rules.

The canonicity of this version is arbitrary. Because the description and record sheet were published in canonical sources and never technically redacted, they could arguably be regarded as (still) canonical as a subvariant of the ON-1K.

The ON-1K was omitted in the 1991 ''[[Record Sheets Volume Three: Heavy 'Mechs]]'' publication (while its variants ON-1V and ON-1VA were included).

==Variants==
*; ON1-C : The original [[Primitive Technology|primitive]] ''Orion'' 'Mech as it was first commissioned lacked an [[LRM]] launcher and used an [[Autocannon/5]] in place of the AC/10.<ref name=TRO3025r/> A massive 360 engine allowed the 'Mech to obtain a maximum speed of nearly 64.8 km/h, however there was not enough saved weight to mount additional weaponry besides two medium lasers, one in each arm. In addition it only mounted 14.5 tons of armor, and ultimately would be considered too lightly armed and armored with the prototype dismissed as a candidate for production.<ref name=XTROPv5/> BV (2.0) = 973<ref>[http://www.masterunitlist.info/Unit/Details/4755/orion-on1-c MUL Profile for ON1-C includes BV2.]</ref>

*; ON1-C 2 : A mixed technology design, built to reduce the strain on Clan Wolf's Inner Sphere production lines, the C 2 utilizes Inner Sphere structural components and predominantly Clan weaponry.  Having felt the sting of Inner Sphere 'Mechs mounting extended range LRMs, designers chose to mount an [[Extended LRM-15]] in the typical left torso mount. The rest of this design's weaponry is Clan grade including an [[ER Large Laser]] that replaces the typical ballistic mount in the right torso. A [[Large Pulse Laser]] is carried in the left arm, while an [[ER medium laser]] is in the right. A [[Streak SRM-4]] sits below the LRM in the left torso. One ton of streak ammo, and three tons of LRMs are stored in a [[CASE II]] protected magazine in the left torso. Twelve double heat sinks are utilized.  BV (2.0) = 2,026<ref>''Recognition Guide: ilClan, vol. 19'', p. 13</ref>

*; ON1-H : Built by General Mechanics, the ON1-H was the third known [[Primitive Technology|primitive]] prototype of the ''Orion'' 'Mech that was eventually accepted for mass production in [[2456]]. While slower than the first iterations, with a top speed of only 54 km/h (the same as that of a ''Mackie'' or ''Banshee''), due to the inclusion of a smaller 275-class engine, the additional weight saved allowed the designers to mount far more firepower. A newly developed [[Prototype AC/10|Class-10 Prototype Autocannon]] was installed with two tons of ammo in place of the AC/5. This was backed up by two 5-tube [[LRM-5|Long-Range Missile launchers]] with one ton of reloads in the left torso for striking enemies at range and a short-range [[SRM-4]] missile launcher and a ton of ammunition installed in the left arm for close-in defense. It was also heavily protected by 21 tons of armor. A minimal amount of heat sinks, however, could cause buildup of heat within crippling levels, but could be avoided by competent MechWarriors.<ref name=XTROPv5/> BV (2.0) = 1,199<ref>[http://www.masterunitlist.info/Unit/Details/7405/orion-on1-h MUL Profile for ON1-H includes BV2.]</ref>

*; ON1-K : Besides the standard ON-1K variant with 25 salvos of SRM ammunition and maximum armor, an otherwise unnamed (in the sense of not distinctively named) subvariant of the ON-1K may or may not exist that carries slightly less armor, and 37 SRM salvos; see [[Orion#Original Configuration|Original Configuration]] above.<ref>''Technical Readout: 3025'': "Orion"</ref>

*; <span id="ON1-M">ON1-M</span> : The M variant is an upgrade using [[Star League]] technology first fielded in [[3049]].  Replacing the standard engine with a Hermes 300 [[XL engine]] and shaving off a half-ton of armor allows the 'Mech to retain the same speed while mounting a number of upgrades.  The LRM-15 has been replaced with a [[Kali Yama Weapons Industries Type V]] [[LRM-20]] launcher and the Autocannon/10 has been upgraded to a [[LB 10-X AC#Kali Yam|Kali Yama Weapons Industries]] [[LB-X Autocannon/10]].  In addition an [[Octagon Missile Magnet]] [[Narc Missile Beacon]] launcher was added to the center torso along with two tons of reloads, while the SRM-4 and the medium lasers have been retained.  The use of eleven [[double heat sinks]] also solves any problems associated with overheating.  This variant was first used in combat during [[Operation Guerrero]] when the FWL attempted to liberate worlds previously ceded to the [[Federated Commonwealth]], with it seeing its first use against the Clans during the [[Jade Falcon Incursion (3058)|Jade Falcon Incursion]].<ref name=TRO3050u/>  BV (1.0) = 1,192,<ref name=CO>''Combat Operations'', p. 130</ref> BV (2.0) = 1,414<ref>''Technical Readout: 3050 Upgrade'', p. 83</ref>

*; ON1-MA : This is one of the many minor variants of the ON1-M model introduced in [[3052]]. The Narc Missile Beacon is removed to allow a larger [[SRM-6]] to replace the four pack.  Both missile racks also have [[Artemis IV Fire Control System]] to increase accuracy.  Finally, [[medium pulse laser]]s are mounted in place of the original mediums.<ref name=TRO3050u/> BV (2.0) = 1,501<ref>''Record Sheets: 3050 Unabridged (Inner Sphere)'', p. 199</ref>

*; ON1-MB : A second minor variant of the ON1-M introduced in [[3058]].  The LB-X Autocannon/10 is swapped for a [[Light Gauss Rifle]] with a single ton of ammunition while the medium lasers are upgraded to [[ER medium laser|extended range versions]].<ref name=TRO3050u/> BV (2.0) = 1,472<ref>''Record Sheets: 3050 Unabridged (Inner Sphere)'', p. 200</ref>

*; ON1-MC : A third minor variant of the ON1-M also introduced in 3058.  The designers removed both missile racks and Narc launcher to make room for [[Medium Range Missile]]s.  In place of the LRM-20 is an [[MRM-20]] while a larger [[MRM-30]] is crammed in the torso where the SRM-4 formerly sat.  Enough room is left to add a head-mounted [[C3 slave unit]].  This variant was much-used by the [[Draconis Combine]].<ref name=TRO3050u/>  BV (2.0) = 1,501<ref>''Record Sheets: 3050 Unabridged (Inner Sphere)'', p. 201</ref>

*; ON1-MD : Another minor variant of the ON1-M, fielded in [[3062]]. A simple weapon swap, the LB-X Autocannon/10 is exchanged for a [[rotary autocannon/5]]. BV (2.0) = 1,597<ref>''Record Sheets: 3050 Unabridged (Inner Sphere)'', p. 202</ref>

*; ON1-M-DC : Introduced in [[3053]], this 1-M subvariant trades one ton each of SRM and Narc ammunition plus one double heat sink for a [[Command Console]]. BV (2.0) = 1,444<ref>''Record Sheets: 3050 Upgrades Unabridged (Inner Sphere)'', p. 198</ref><ref>[http://www.masterunitlist.info/Unit/Details/4760/orion-on1-m-dc MUL online entry for the ON1-M-DC variant]</ref>

*; ON1-V : A basic modification of the ON1-K first seen in [[2799]], the ON1-V moves the left-torso SRM-4 to the left arm and removes three tons of armor to make room for an additional SRM-4 launcher in the right arm in order to give the ''Orion'' even greater close-range damage capability.<ref name=TRSWp144f /><ref name=TRO3039/> BV (1.0) = 931,<ref name=CO/> BV (2.0) = 1,298<ref>''Record Sheets: 3039'', p. 161</ref>

*; <span id="ON1-VA">ON1-VA</span> : A modification along the same lines as the ON1-V introduced in [[2901]] the VA model also moves the left torso SRM-4 to the left arm, but removes the LRM launcher rather than armor, to add the second SRM-4 launcher, sacrificing some long-range damage capabilities for superior close-combat capabilities.<ref name=TRSWp144f /><ref name=TRO3039/> BV (1.0) = 1,111,<ref name=CO/> BV (2.0) = 1,328<ref>''Record Sheets: 3039 Unabridged'', p. 162</ref>

*; ON1-V-DC : This command subvariant of the 1-V, introduced in [[2913]], trades 1 ton each of LRM/SRM and autocannon ammunition for a [[Command Console]]. BV (2.0) = 1,310<ref>''Record Sheets: 3039'', p. 163</ref><ref>[http://masterunitlist.info/Unit/Details/2337/orion-on1-v-dc MUL online entry for the ON1-V-DC variant]</ref>

*; ON2-M : The 2M is another upgrade of the ''Orion'' using Star League technology.  Built in [[3063]] the 'Mech uses an [[Endo Steel]] chassis and utilizes ten double-strength heat sinks to save weight and for their greater heat-dissipation ability. For long-range combat, the ON2-M is armed with a [[Gauss rifle]] as well as an LRM-15 linked to an Artemis IV FCS for increased accuracy. For closer ranges, the 'Mech has three medium pulse lasers. The ON2-M is armored with twelve and a half tons of [[ferro-fibrous]] armor. BV (1.0) = 1,633<ref name=CO/> (1,624),<ref>''Record Sheets: Upgrades'', p. 130</ref> BV (2.0) = 1,828<ref>''Master Unit List: Battle Values'', p. 132</ref>

*; ON3-MX : This experimental ''Orion 3100'' variant was introduced in [[3075]] as "a BattleMech for the [[thirty-second century]]"; although its flaws prevented any immediate production it gave Kali Yama valuable experience and a few prototypes were sold.  It is equipped with an [[Experimental Technology|experimental]] [[Extended LRM-10]] and [[Improved Heavy Gauss Rifle]]. Three tons of ammunition feeds the LRM launcher while the iHGR gets four tons of ammunition. For close in work, this ''Orion'' variant has an ER medium laser in each arm. To provide room for these weapons, the 'Mech has an [[XL engine]], standard armor, and standard internal structure, and only the ELRM ammo is protected by CASE. BV (2.0) = 1,849<ref>''Experimental Technical Readout: Marik'', p. 5</ref>

*; ON3-M : This version introduced in [[3083]] was based on the earlier ON3-MX, although it addresses some of the shortcomings of that 'Mech and shares many of the same features as the ON1-M.  Providing a more balanced weapon suite it still carries an Extended LRM-15 with four tons of ammo and an ER medium laser in each arm but instead uses a Grand Slam [[Gauss rifle]] with two tons of ammo in the right torso.  It also uses [[CASE II]] to protect the ammunition and has a head-mounted [[Target Acquisition Gear|TAG]] system to call in artillery.  Initial feedback and advanced orders convinced Kali Yama to switch most of their ''Orion'' production lines over to making the ON3-M in [[3086]], but were soon set back a few years later when pressure from the [[Republic of the Sphere]] caused the [[Federated Suns]] to cancel their order.  The company has seen sold the 'Mech at below-market prices and suffered financial hardship. BV (2.0) = 1,826<ref name=TRO:Proto>''Technical Readout: Prototypes'', p. 133</ref><ref>''Record Sheets: Prototypes'', p. 73</ref>

*; ''Orion'' C : Developed by the [[Wolf Empire]], this variant starts with an ON2-M but replaces the armor with [[Ferro-Lamellor]] and the weaponry with [[Streak LRM]]s and [[ER Pulse Laser]]s.<ref>''Technical Readout: 3150'', p. 223</ref> BV (2.0) = 2343 <ref>''Record Sheets: 3150'', p. 289</ref>

*; Dual Cockpit refits : The ''Orion'' is one of the [[Free Worlds League]]'s preferred 'Mechs on which to install [[Dual Cockpit]]s. Standard refits usually install the Dual Cockpit on an ON1-V or ON1-M, requiring the removal one ton of SRM ammunition.<ref>''MechWarrior Companion'', pp. 51–52: "House Conversions"</ref> 

===Custom Variants===
*; ON1-K ''Kerensky'' : The [[Revenant (Individual Orion BattleMech)|personal BattleMech]] of [[Commanding General of the Star League Defense Force|Commanding General]] [[Aleksandr Kerensky]] during the [[Amaris Civil War|war]] against [[Stefan Amaris|the Usurper]].  Designers removed the LRM-15 and Autocannon/10 to make room for other equipment, adding an [[Experimental Technology|experimental]] [[Snub-Nose PPC]] in the left torso and an [[Artemis IV Fire Control System]] for the SRMs.  The right torso has a [[Gauss rifle]] in the former location of the autocannon.  The medium lasers from the original model are retained.  Finally, ferro-fibrous armor and CASE are used for added protection.  BV (2.0) = 1,821<ref>''Record Sheets: 3050 Unabridged (Inner Sphere)'', p. 204</ref>

===Apocryphal Variants===
{{ApocryphalContentStart}}
''From [[MechWarrior Online]]:''
*; ON1-P ''Protector'' : A late 3040s era homage to General Kerensky's custom variant, the ''Protector'' carries an almost identical weapons loadout. The only notable difference is its use of a standard [[PPC]] in the place of the still-[[lostech]] snub-nosed version, dropping the CASE and volume of ferro-fibrous armor carried to free up the weight for the heavier weapon.<ref>[https://mwomercs.com/forums/topic/134294-patch-day-september-3rd-live/ ''MechWarrior Online'' (video game)]</ref>

''From [[MechWarrior 5: Mercenaries#Heroes of the Inner Sphere|''MechWarrior 5: Heroes of the Inner Sphere'' Expansion Pack]]:''
*; <span id="ON1-YAJ">ON1-YAJ ''Yad al-Jauza''</span> : Piloted by [[Aditi Whidbey]], who had been driven to madness by a cult known as the [[Church of Kali]], she claimed that the ''Orion'' had fallen out of the sky and styled it ''Yad al-Jauza'' or "Hand of Orion." The 'Mech is built upon an XL engine. A large laser is mounted in each arm, with the right arm additionally mounting an LRM-10; two LRM-10s are mounted in the left torso, along with another large laser. Fifteen double heat sinks keep the 'Mech cold.<ref name=MW5HoIS>''MechWarrior 5: Mercenaries, Heroes of the Inner Sphere''</ref>
{{ApocryphalContentEnd}}

==Design Quirks==
The ON1-K ''Orion'' and variants, unless specified otherwise, are subject to the following [[Design Quirks]]:<ref>''BattleMech Manual'', p. 93: Design Quirk Table - Orion Entry</ref>
* [[Anti-Aircraft Targeting]]
* [[Easy to Maintain]]
* [[Rugged|Rugged (1)]]

The ON1-H ''Orion'' variant is subject to the following [[Design Quirks]]:<ref name=XTROPv5/>
* [[Ammunition Feed Problem]] (AC/10)
* [[Easy to Maintain]]
* [[Obsolete]] (2525)

The ON3-M ''Orion'' variant is subject to the following [[Design Quirks]]:<ref name=TRO:Proto/>
* [[Difficult Ejection]]
* [[Easy to Maintain]]

==Notable Pilots==
:''See: [[:Category:Notable Orion Pilots]]

==Related BattleMechs==
* ''[[Orion IIC]]'' - As the chosen 'Mech of the [[Clans]]' revered "Great Father", the ''Orion'' bordered on being a [[Totem 'Mech]] for [[Clan Wolf]], who produced a [[IIC]] version of it. Jealously guarded by the Wolves, this design sports one [[Gauss rifle]], one [[LRM-20]], two [[ER Large Lasers]] and one [[SRM-4]].

* ''[[Perseus]]'' - With a long history of production and deployment of the ''Orion'', plus the 'Mech's noted spacious design, the [[Free Worlds League]] used the design as the basis of their first homegrown [[OmniMech]].

* ''[[Pandarus]]'' - Similar to the ''Perseus'', this design was intended to be an OmniMech (albeit with a missile boat focus), however budget issues led to [[Kali Yama]] building the prototype as a standard BattleMech using a mothballed ''Orion'' chassis.

==Notes==
* The original ''Orion'' artwork shows, and the text in ''[[TRO:3025]]'' states, that the SRM-4 of the ON1-K is mounted in the Orion's left arm (with two of the six tubes pictured serving as hookup points for connecting with [[Coolant Truck]]s). However, the stat block and accompanying record sheet in ''[[BattleTech Reinforcements]]'', and all subsequent record sheets, place the SRM-4 in the left torso. This disconnect was resolved with updated artwork created for the [[2019 Clan Invasion crowdfunding campaign]], which clearly places the SRM-4 in the left torso, and not the left arm.
* While the description of the ON1-C prototype in ''Experimental Technical Readout: Primitives, Volume 5'' describes that it also mounted an SRM-4, the included Record Sheet does not show this. It is not clear if this was intentional as the profile of the original primitive ''Orion'' also describes "three" prototypes. It is possible, but not conclusive, that the SRM-4 version was another test frame of the ON1-C, the first prototype as described, and the included record sheet as the candidate for the second with 3 tons freed possibly for more armor.

==Gallery==
<gallery>
3025 Orion1.jpg|Original ON1-K ''Orion'' from ''[[Technical Readout: 3025|TRO:3025]]''
ON1-M.png|ON1-M ''Orion'' from ''[[Technical Readout: 3050|TRO:3050]]''
3050U Orion.jpg|ON1-M ''Orion'' from ''[[Technical Readout: 3050 Upgrade|TRO:3050 Upgrade]]''
XTROM Orion.jpg|ON3-MX ''Orion'' from ''[[Experimental Technical Readout: Marik|XTRO:Marik]]''
ON1-HOrion.png|ON1-H ''Orion'' from ''[[Experimental Technical Readout: Primitives, Volume 5|XTRO:Primitives V]]''
Orion ON3-M TROPrototypes.jpg|ON3-M ''Orion'' from ''[[Technical Readout: Prototypes|TRO:Prototypes]]''
Orion RGilClan v19.png|''Orion'' from ''[[Recognition Guide: ilClan, vol. 19|RG:ilClan v19]]''
CityTech Orion.jpg|''Orion'' in urban terrain from ''[[CityTech, Second Edition|CityTech]]''
Coventry 2 (The Battle of Coventry).png|An ''Orion'' under attack by [[Elemental|Elementals]] from ''[[The Battle of Coventry (scenario pack)|Battle of Coventry]]''
Orion (A Kerensky) BTL.png|ON1-K ''Orion'' piloted by [[Aleksandr Kerensky]] from ''[[BattleTech: Legends|BT:Legends]]''
Orion (Revenant) BTL.png|ON1-K ''Orion'' [[Revenant (Individual Orion BattleMech)|"''Revenant''"]] piloted by [[Theodore Kurita (31st c.)|Theodore Kurita]] from ''BT:Legends''
Historical Liberation of Terra 2.jpg|[[Aleksandr Kerensky]]'s ''Orion'' entering [[Stefan Amaris]] palace, at the end of [[Amaris Civil War]] from ''[[Historical: Liberation of Terra Volume 2]]'' cover
Amaris surrenders to Kerensky 1stSW.jpg|Stefan Amaris surrendering to Kerensky in his Orion
CCG Unlimited Orion K.jpg|ON1-K ''Orion'' in motion from ''[[BattleTech Trading Card Game|CCG]]''
CCG Unlimited Orion M.jpg|ON1-M ''Orion'' in combat from ''CCG''
File:CityTech Second Edition - Orion.jpg|''Orion'' miniature from ''[[CityTech, Second Edition]]''
File:Alpha Strike Battle Lance - Orion.jpg|''Orion'' miniature from ''[[BattleTech Alpha Strike: Battle Lance Pack]]''
File:Inner Sphere Direct Fire Lance - Orion.jpg|''Orion'' miniature from ''[[BattleTech: Inner Sphere Direct Fire Lance]]''
</gallery>

==References==
<references/>

==Bibliography==
{{div col|colwidth=25em}}
* ''[[Combat Operations]]''
* ''[[Experimental Technical Readout: Marik]]''
* ''[[Experimental Technical Readout: Primitives, Volume 5]]''
* ''[[Field Manual: Periphery]]''
* ''[[Field Report 2765: Periphery]]''
* ''[[Historical: Liberation of Terra Volume 2]]''
* ''[[Master Unit List: Battle Values]]''
* ''[[Record Sheets: 3025/3026]]''
* ''[[Record Sheets: 3039]]''
* ''[[Record Sheets: 3050]]''
* ''[[Record Sheets: 3050 Upgrades Unabridged (Inner Sphere)]]''
* ''[[Record Sheets: Prototypes]]''
* ''[[Record Sheets: Upgrades]]''
* ''[[Solaris VII: The Game World]]''
* ''[[Technical Readout: 3025]]''
* ''[[Technical Readout: 3039]]''
* ''[[Technical Readout: 3050]]''
* ''[[Technical Readout: 3050 Upgrade]]''
* ''[[Technical Readout: 3150]]''
* ''[[Technical Readout: Prototypes]]''
* ''[[Technical Readout: Succession Wars]]''
{{div col end}}

[[Category:BattleMechs]]
[[Category:Heavy BattleMechs]]
[[Category:75 ton BattleMechs]]
[[Category:Free Worlds League BattleMechs]]
[[Category:Star League BattleMechs]]
[[Category:Terran Hegemony BattleMechs]]