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Ultra AC/20

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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 4Edit

Manufactured on Manufactured by Typically used in References
Xerxes [4]

Defiance ThunderEdit

Manufactured on Manufactured by Typically used in References
Hesperus II Defiance Industries Demolisher II Heavy Tank, BTZ-3F Blitzkrieg [5][6]


Ceres Huang DiEdit

Model SHEdit

Mydron ObliteratorEdit

Series IIEdit

Type 10Edit

Type 20Edit

Brand Planet Company
Devastator Tamaron Ashton 'Mech Production Complex
Ceres Huang Di Menke, St. Ives Ceres Metals Industries [7]
Mydron Gulkana Yeffters Weapons Factory [8]

Model Used by
Mydron Ultra Autocannon/20 Enforcer III ENF-6H (Mech)
Ceres Huang Di Ultra AC/20 Autocannon [9] Po II Heavy tank IS (Vehicle)
Devastator Ultra 20 Autocannons [10] Hunchback IIC Clan (Mech)
Model SH Ultra-20 Autocannon [11] Burrock Clan (Mech)
Series II Ultra Class 20 Autocannon [12] Kodiak Clan (Mech)
Type 10 Ultra Autocannon/20 [13] Clan SM1 tank destroyer (vehicle)
Type-20 Ultra AC/20 [14] Fire Scorpion 3 Clan (Mech)


  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. TRO 3067 p.168
  5. TRO 3060 p.30
  6. TRO 3060 p.94
  7. TRO 3085
  8. Technical Readout: 3050 Upgrade, p. 56
  9. 3085 p. 36
  10. TRO 3058U p. 172
  11. TRO 3067 p. 126
  12. TRO 3058U p. 194
  13. TRO 3075 p. 130
  14. Milspecs