LB-X Autocannon.jpg
Production information
Type ballistic (direct/cluster)
Tech Base Clan / Inner Sphere (IS)
Year Availability Clan = 2825 (CCY)

IS = 3058 (FS)

Technical specifications
Heat Clan = 1

IS = 1

Damage Clan = 5 (slug)
1/pellet (cluster)

IS = 5 (slug)
1/pellet (cluster)

Minimum Range Clan = 3

IS = 3 IS(THB) = 4

Short Range Clan = 1-8

IS = 1-7 IS(THB) = 1-8

Medium Range Clan = 9-15

IS = 8-14

Long Range Clan = 16-24

IS = 15-21

Tons Clan = 7

IS = 8

Critical Slots Clan = 4

IS = 5

Ammo Per Ton Clan = 20

IS = 20

Cost (unloaded) Clan = 250,000

IS = 250,000

Ammo Cost (per ton) Clan = 9,000 (slug) C-bills
15,000 (cluster) C-bills

IS = 9,000 (slug) C-bills
15,000 (cluster) C-bills

BV (2.0) Clan = 93[1]
12 (Ammo)[1]

IS = 83[2]
10 (Ammo)[2]


Like the LB 10-X AC, the LB 5-X AC was capable of firing two different types of ammunition: slug and cluster. A slug shot was akin to a traditional autocannon round while a cluster shot fragments like a shotgun round and spreads its damage around. This effect creates flak that is useful against VTOLs.


In the years between the Second Exodus and the beginning of Operation KLONDIKE, the nascent Clans began development of what would become the LB 5-X. Experimental prototype versions of this new weapon were used during Operation KLONDIKE in small quantities. The Clan prototype LB 5-X available during this period had identical stats to the Inner Sphere LB 5-X autocannon, other than that it required a bit more space.[3]


Mydron Excel 5SG[edit]

Manufactured on Manufactured by Typically used in References
New Syrtis Johnston Industries Garm [4]
Richvale Quikscell Company Condor [5]

Type OVR-X[edit]

Manufactured on Manufactured by Typically used in References


  • This article refers to a common object and addresses the object as a common noun. The preferred term is "LB 5-X AC", with "autocannon" abbreviated to "AC" (except on section titles & table headings, where "LB 5-X Autocannon" is favored).
  • This item was also previously published in the Tactical Handbook with slightly different 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, "Prototype Clan Systems"
  4. Technical Readout: 3060 Revised, p. 82
  5. Technical Readout: 3075, p. 54