Extended LRM-20

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Extended LRM-20
Production information
Type Missile Weapon
Tech Base Inner Sphere
Year Availability 3054[1]
Technical specifications
Heat 12
Damage 1/Missile
Minimum Range 10
Short Range 1-12
Medium Range 13-22
Long Range 23-38
Extreme Range 39-44
Tons 18[1]
Critical Slots 8
Ammo Per Ton 4
Cost (unloaded) 500,000[1]
Ammo Cost (per ton) 35,000[1]
BV (1.0) ???
BV (2.0) 268 launcher/34 ammunition[3]


The Extended LRM (ELRM) system was designed by engineers in the Federated Commonwealth to offset the incredible range advantage of most Clan weapons. The ELRM pairs a standard LRM to a booster system that gives the missile more fuel, and thus, more range. Offsetting the range advantage is the fact that the minimum range of the weapon is increased by over 50%, combined with a reduced ammunition capacity and a heavier, bulkier launcher.

The ELRM cannot use the improved guidance systems like the Artemis IV or Narc Missile Beacon. Special munitions are not available for the ELRM. If a rack of ELRMs fires at a target inside the minimum range, half the missiles will not arm.[4]

By 3080, all Extended LRM launchers would enter limited production and start to appear on more technologically advanced combat units.[2]


ELRMs are manufactured at the following facilities:[5]

Brand Planet Company Used By References
Unknown New Avalon Achernar BattleMechs ??? [5]
Unknown Coventry Coventry Metal Works ??? [5]
Unknown Skye Cyclops Incorporated ??? [5]
Unknown Tharkad TharHes Industries ??? [5]


  1. 1.0 1.1 1.2 1.3 1.4 Tactical Operations, p. 409, "Heavy Weapons And Equipment Construction Data"
  2. 2.0 2.1 Technical Readout: Prototypes, p. 207, "Jihad Technology Advancement Table" -
  3. Tactical Operations, p. 383, "Inner Sphere Weapons And Equipment BV Table (Addendum)"
  4. Tactical Operations, p. 327, "ERML Launchers"
  5. 5.0 5.1 5.2 5.3 5.4 Tactical Handbook, p. 58, "Game Notes"