Ultra AC/20

(Redirected from UAC-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:

Brand Planet Company
Defiance Thunder Hesperus II Defiance Industries
Devastator Tamaron Ashton 'Mech Production Complex
Ceres Huang Di Menke, St. Ives Ceres Metals Industries [4]
Mydron Gulkana Yeffters Weapons Factory [5]

Model Used by
Aero-Model 4 Ultra-20 Autocannon [6] Xerxes Clan (Fighter)
Defiance Thunder Ultra AC/20 Autocannon [7] Demolisher II Heavy Tank IS (Vehicle)
Defiance Thunder Ultra AC/20 Autocannon [8] BTZ-3F Blitzkrieg IS (Mech)
Mydron Ultra Autocannon/20 [9] Enforcer III ENF-6H (Mech)
Ceres Huang Di Ultra AC/20 Autocannon [10] Po II Heavy tank IS (Vehicle)
Devastator Ultra 20 Autocannons [11] Hunchback IIC Clan (Mech)
Model SH Ultra-20 Autocannon [12] Burrock Clan (Mech)
Series II Ultra Class 20 Autocannon [13] Kodiak Clan (Mech)
Type 10 Ultra Autocannon/20 [14] Clan SM1 tank destroyer (vehicle)
Type-20 Ultra AC/20 [15] Fire Scorpion 3 Clan (Mech)

See Also[edit]

The Ultra Autocannon/20 has been used in various video games, each with their own stats for the weapon; below is a list of the games that use it along with a link to each version's stats:


  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 3085
  5. Technical Readout: 3050 Upgrade, p. 56
  6. TRO 3067 p. 168
  7. TRO 3060 p. 30
  8. TRO 3060 p. 94
  9. TRO3050U
  10. 3085 p. 36
  11. TRO 3058U p. 172
  12. TRO 3067 p. 126
  13. TRO 3058U p. 194
  14. TRO 3075 p. 130
  15. Milspecs