< Autocannon(Redirected from AC-20)
Production information
Type Ballistic (Direct Fire)
Tech Base Inner Sphere
Year Availability 2500 (LC)
Technical specifications
Heat 7
Damage 20
Minimum Range N/A
Short Range 1-3
Medium Range 4-6
Long Range 7-9
Tons 14
Critical Slots 10
Ammo Per Ton 5
Cost (unloaded) 300,000
Ammo Cost (per ton) 10,000
BV (1.0) 178
BV (2.0) 178[1]
22 (Ammo)[1]


The Autocannon is a direct-fire ballistic weapon, firing HEAP (High-Explosive Armor-Piercing) rounds at targets either singly or in bursts.

Different manufacturers and models of autocannons have different calibers (25mm-203mm) and rates of fire. Due to this, autocannons are grouped into generic "classes" of autocannons with common damage ratings, with Autocannon/20s doing massive damage while having very short range.

An example of the rating system: the Crusher Super Heavy Cannon is a 150mm weapon firing ten shells per "round" while the Chemjet Gun is a 185mm weapon firing much slower, and causing higher damage per shell. Despite their differences, both are classified as Autocannon/20s due to their damage output.


A standard AC/20 can fire multiple types of ammunition, most of which were developed by the Federated Commonwealth in order to make their large supply of standard autocannon more useful in the age of Ultra and LB-X autocannon. These types are:

Type BV (1.0) Cost
Standard 20 10,000
Armor-Piercing 80 40,000
Flechette 10 15,000
Incendiary 20 20,000
Precision 80 60,000


The Autocannon/20 is manufactured on the following planets:

Brand Planet Company/Used by
ChemJet Gun 185mm Betelgeuse Aldis Industries
ChemJet Gun 185mm New Samarkand New Samarkand Metals
ChemJet Gun 185mm Terra Aldis Industries
Armstrong Requiem Ramora United Outworlders Corporation
Crusher SH Cannon Kalidasa Quikscell Company
Crusher SH Cannon Indicass Ceres Metals Industries
Defiance 'Mech Hunter Hesperus II Defiance Industries
Imperator Zeta-A Atreus Imperator Automatic Weaponry
Kali Yama Big Bore Kalidasa Kali Yama Weapons Industries Incorporated
Luxor Devastator-20 New Syrtis Johnston Industries
Mydron A Bithinia Bithinian Ballistics
Mydron A Gulkana Yeffters Weapons Factory
Pontiac 100 Sterope Sterope Defense Industries
Scarborough Original 20 Al Na'ir Scarborough Manufacturers
Scarborough Original 20 Scarborough Scarborough Limited

See Also[edit]

The 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. 317, "Inner Sphere Weapons and Equipment BV Table"