Sarna News: Bad 'Mechs - Hoplite

Ultra AC/20

Ultra Autocannon.jpg
Ultra AC/20
Production information
Type Ballistic (Rapid-Fire)
Tech Base Clan / Inner Sphere (IS)
Year Availability Clan = 2825 (CSV)

IS = 3060 (LA)

Technical specifications
Heat Clan = 7/shot

IS = 8/shot

Damage Clan = 20/shot

IS = 20/shot

Minimum Range Clan = 0

IS = 0

Short Range Clan = 1-4

IS = 1-3

Medium Range Clan = 5-8

IS = 4-7

Long Range Clan = 9-12

IS = 8-10

Tons Clan = 12

IS = 15

Critical Slots Clan = 8

IS = 10

Ammo Per Ton Clan = 5

IS = 5

Cost (unloaded) Clan = 480,000

IS = 480,000

Ammo Cost (per ton) Clan = 20,000

IS = 20,000

BV (2.0) Clan = 335[1]
42 (Ammo)[1]

IS = 281[2]
35 (Ammo)[2]


The Ultra AC/20 is the largest bore Ultra Autocannon. Like all Ultra autocannons, it is capable of twice the rate of fire of a standard autocannon, doubling its heat output and, potentially, its damage. Only the brand new Clan HAG 40 can match the sheer damage output of the Ultra AC/20, though even that cannot place 20 points of damage squarely in a single target area. The only weapons that are capable of delivering more damage to one location are the Heavy Gauss Rifle and the experimental Improved Heavy Gauss.


In the years between the Second Exodus and the beginning of Operation KLONDIKE the nascent Clans began development of what would become the Ultra Autocannon/20. Experimental prototype versions of this new weapon were used during Operation KLONDIKE in small quantities. The Clan Prototype Ultra Autocannon/20 available during this period has identical stats to the Inner Sphere Ultra Autocannon/20, with the following differences: the Ultra Autocannon/20 occupies one additional critical slot, and suffers a weapon jam on a to-hit result of 2 or 3.[3]


The Ultra AC/20 is manufactured on the following planets in the Inner Sphere:

Aero-Model 4[edit]

Manufactured on Manufactured by Typically used in References
Kirin Kirin Orbital Works SJ-3 Xerxes [4]

Defiance Thunder[edit]

Manufactured on Manufactured by Typically used in References
Hesperus II Defiance Industries Demolisher II Blitzkrieg Hauptmann [5][6]


The Devastator is built to Clan specifications and has a calibre of 200mm.[7]

Manufactured on Manufactured by Typically used in References
Various Various Hunchback IIC [8]

Model SH[edit]

The Model SH Ultra Autocannon is built to Clan specifications.[9]

Manufactured on Manufactured by Typically used in References
Sudeten Tokasha MechWorks Alpha Olivetti Weapons Kraken [10]

Type 10[edit]

The Type 10 is a 120mm cannon.[11]

Manufactured on Manufactured by Typically used in References
Luthien Luthien Armor Works SM1 Tank Destroyer [11]

Ceres Huang Di[edit]

Manufactured on Manufactured by Typically used in References
Menke St. Ives Ceres Metals Industries Po [12]

Type 20[edit]

Brand Planet Company
Devastator Tamaron Ashton 'Mech Production Complex
Mydron Gulkana Yeffters Weapons Factory [13]


  1. 1.0 1.1 TechManual, p. 318, "Clan Weapons and Equipment BV Table"
  2. 2.0 2.1 TechManual, p. 317, "Inner Sphere Weapons and Equipment BV Table"
  3. Historical: Operation KLONDIKE, p. 156-157, "Prototype Clan Systems"
  4. Technical Readout: 3067 p. 168
  5. TRO 3060 p.30
  6. TRO 3060 p.94
  7. The Price of Duty, ch. 8
  8. :Technical Readout: Clan Invasion, p. 38
  9. Technical Readout: 3067 p. 126
  10. Technical Readout: 3055, p. 122
  11. 11.0 11.1 A Call to Arms, Prologue
  12. Technical Readout: 3085, p. 36
  13. Technical Readout: 3050 Upgrade, p. 56