Disclaimer: I've loved the look of the firefly in the 3050 revised book, and had some success with the tiny tank. So when I started looking at how the Terran Supremacy would upgrade the royals, I had to include a Firefly.
Firefly FFL-4TS
Mass: 30 tons
Chassis: Earthwerks Firefly endo
Power Plant: GM 150 Light
Cruising Speed: 54 kph
Maximum Speed: 86.4 kph
Armor: StarSlab
Armament:
3 ER Medium Laser
2 Small X-Pulse Laser
1 MML 3
Manufacturer: Coventry/Earthwerks
Primary Factory: Terra
Communication System: Datcom 18 with Guardian ECM
Targeting & Tracking System: Radcom TXX
Introduction Year: 3090
Tech Rating/Availability: E/X-X-E-X
Cost: 3,666,000 C-bills
Overview
A Mainstay of the SLDF forces, it is no surprise that the Firefly remained in production in the Terran Supremacy. After close to 400 years of service, the Terran Supremacy ordered an upgrade to the tough tiny ‘Mech.
Capabilities
The new Firefly switches to endo-steel internal structure instead of ferro fibrous armor, allowing for the replacement of the fragile XL engine with a smaller and heavier light engine. A Multi Missile launcher 3 rack replaces the older LRM 5, the reduction in ranged firepower being a good trade for the greater flexibility. The laser systems are upgraded as well, with three ER medium lasers spaced about the torso, and a pair of small x-pulse lasers in the arms. The recent production issue X-pulse lasers allow the Firefly enhanced anti-infantry abilities. The other major change from the FFL3A is the removal of the Target Acquisition Gear and installation of a Guardian ECM in the left torso. The ten double heat sinks hand most of the heat from the weapons, but they can be quickly overwhelmed by repeated alpha strikes. Knowing this, Coventry/Earthwerks has taken a page from the Shadow Hawk and enhanced the life support. The firepower, mixed with the thick standard plate armor, has made the Firefly an anvil against which its lancemates drive light mechs
Deployment
While the Firefly has been seen across the face of the Terran Supremacy and the 4a Exported to the Periphery states, the 4TS is used primarily in Supremacy space.
Type: Firefly
Technology Base: Inner Sphere (Experimental)
Tonnage: 30
Battle Value: 992
Equipment Mass
Internal Structure Endo Steel 1.5
Engine 150 Light 4.5
Walking MP: 5
Running MP: 8
Jumping MP: 4
Double Heat Sink: 10 [20] 0
Gyro: 2
Cockpit: 3
Armor Factor: 104 6.5
Internal
Structure Armor
Value
Head 3 8
Center Torso 10 15
Center Torso (rear) 5
R/L Torso 7 11
R/L Torso (rear) 3
R/L Arm 5 10
R/L Leg 7 14
Weapons
and Ammo Location Critical Tonnage
2 Jump Jets LL 2 1
ER Medium Laser CT 1 1
Double Heat Sink RT 3 1
ECM Suite RT 2 1.5
ER Medium Laser RT 1 1
Small X-Pulse Laser LA 1 1
Double Heat Sink LA 3 1
MML 3 SRM Ammo (33) LT 1 1
MML 3 LT 2 1.5
CASE LT 1 0.5
MML 3 LRM Ammo (40) LT 1 1
Double Heat Sink LT 3 1
ER Medium Laser LT 1 1
2 Jump Jets RL 2 1
Small X-Pulse Laser RA 1 1
Double Heat Sink RA 3 1
Features the following design quirks: Improved Life Support, No/Minimal Arms, No Torso Twist