Production information
Manufacturer Coventry/Earthwerks Combine of Terra(4B; destroyed 2779)[1]
Ceres Metals Industries of Lockton(5A)[2]
Production Year 2790[3]
Model FFL-4B[1]
Class Light
Cost 2,342,600 C-bills
Technical specifications
'Mech type Inner Sphere BattleMech
Mass 30 tons
Chassis Earthwerks Firefly
Armor StarSlab/1 with CASE
Engine GM 150
Communications System Datcom 18
Targeting Tracking System Radcom TXX
Heat Sinks 10 single
Speed 86 km/h
Jump Jets Lexington Lifters
BV (1.0) 716
BV (2.0) 870[1][4]


Until the arrival of Wolf's Dragoons in 3005, the 2790 Firefly was a 'Mech thought to be extinct from the rigors of the Succession Wars. Since it was reintroduced to the Inner Sphere, the 'Mech has been refitted by Wolf's Dragoons with Star League technology. The Firefly is a well-armed recon 'Mech that tips the scales at thirty tons, with a maximum ground speed of 86.4 km/h, the and ability to jump up to 120 meters. As a scout 'Mech, the Firefly gives average performance with its energy weapon-heavy arsenal and is useful in both a recon and guerrilla fighter role.

Weapons and Equipment[edit]

The Firefly is armed with a Coventry Five-Tube LRM-5 for long-range firepower and to attempt to keep enemies at a distance. If facing a determined enemy that is intent on closing, the Firefly carries three Martell medium lasers, which can cause a considerable amount of damage. Finally, to protect against missile attacks, the Firefly carries a SureFire 444 anti-missile system in the left arm, with a "false" AMS in the right arm.[5]


  • FFL-3PP2 
    Another refit of the FFL-3SLE, this time simply using standard armor plating instead of the advanced ferro-fibrous composites. BV (2.0) = 873[11]
  • FFL-4A 
    An early variant of the Firefly, and one that accompanied the Dragoons to the Inner Sphere, the -4A carries a similar weapons payload to the -4B model, although it keeps the small laser battery of the -3A instead of the anti-missile system. BV (1.0) = 649, BV (2.0) = 831[13]

Design Quirks[edit]

The Firefly has the following Design Quirk:[19][20]

Notable Pilots[edit]

See Category:Notable Firefly Pilots


  • As of the first printing of Record Sheets: Succession Wars, the -3A is half a ton underweight.
  • In German products, the unit's proper name was altered to Zecke, which translates to Tick. The model code was accordingly changed to ZCK-4A.



  1. 1.0 1.1 1.2 1.3 1.4 1.5 Technical Readout: Succession Wars, pp. 20–21: "FFL-4B Firefly"
  2. 2.0 2.1 Recognition Guide: ilClan, vol. 29, p. 12: "Firefly"
  3. MUL online date for the Firefly
  4. Technical Readout: 3050 Upgrade, p. 17
  5. Technical Readout: Succession Wars, p. 20
  6. Historical: Operation Klondike, p. 165
  7. Record Sheets: Succession Wars, p. 28
  8. MUL online entry for the FFL-3A variant
  9. Record Sheets: Operation Klondike, p. 28
  10. Record Sheets: Operation Klondike, p. 29
  11. Record Sheets: Operation Klondike, p. 30
  12. Record Sheets: Operation Klondike, p. 31
  13. Record Sheets: Operation Klondike, p. 32
  14. Master Unit List: Battle Values, p. 94
  15. Master Unit List: Battle Values, p. 95
  16. Starterbook: Wolf and Blake, pp. 29, 95.
  17. Record Sheets: Upgrades, p. 41
  18. Record Sheets: Operation Klondike, p. 33
  19. BattleMech Manual, p. 91: "BattleMech Quirk Table"
  20. BattleMech Manual Errata (Version 6.01), p. 9