Picture and version info taken from sarna, the masterunitlist and the Solaris Skunk Werks
| EXT-4D | EXT-4Db | EXT-4A | EXT-5E | |
|---|---|---|---|---|
| Overview | ||||
| Type | Battlemech | Battlemech | Battlemech | Battlemech |
| Tonnage | 65 | 65 | 65 | 65 |
| Engine | 390 XL | 390 XL | 325 Standard | 390 XL |
| Top Speed | 92.7 kph | 92.7 kph | 92.7 kph | 92.7 kph |
| Max. Engine | 400 (min: 325) | 400 (min: 325) | 390 | 400 (min: 325) |
| Armor | Standard | Standard | Standard | Standard |
| Internal Structure | Standard | Endo-Steel | Standard | Endo-Steel |
| Heat Sinks | 10 Double | 11 Double | 10 Single | 10 Double |
| Jump Jets | 6 | 6 | 5 | No |
| ECM Capable | No | No | No | No |
| MASC Capable | No | No | No | Yes |
| Weapons and Equipment | ||||
| Head | Small Laser | Small Laser | Small Laser | |
| Left Arm | Medium Laser x2 | Medium Laser x2 | ER Medium Laser x2 | |
| Left Torso | LRM-10, Jump Jet x3 | Medium Laser x2, Jump Jet x3 | LRM-10, Jump Jet x2 | NARC |
| Center Torso | Engine, LRM Ammo | Engine, Medium Laser x2 | Engine, LRM Ammo, Jump Jet | Engine, Improved C3 Computer |
| Right Torso | AMS, AMS Ammo, Jump Jet x3 | Medium Laser x2, Jump Jet x3 | Machine Gun, MG Ammo, Jump Jet x2 | NARC Ammo x4, MASC |
| Right Arm | Medium Laser x2 | ER Large Laser | Medium Laser x2 | ER Medium Laser x2 |
| Left Leg | ||||
| Right Leg | ||||
| Hardpoints | ||||
| Head | 1 Energy | 1 Energy | 1 Energy | |
| Left Arm | 2 Energy (Available Actuators: Upper, Lower, Hand) | (Available Actuators: Upper, Lower, Hand) | 2 Energy (Available Actuators: Upper, Lower, Hand) | 3(2) Energy (Available Actuators: Upper, Lower, Hand) |
| Left Torso | 2(1) Missile | 2 Energy | 1 Missile | 2(1) Missile |
| Center Torso | 2 Energy | |||
| Right Torso | 1 AMS | 2 Energy | 1 Ballistic | |
| Right Arm | 2 Energy (Available Actuators: Upper, Lower, Hand) | 1 Energy (Available Actuators: Upper, Lower, Hand) | 2 Energy (Available Actuators: Upper, Lower, Hand) | 3(2) Energy (Available Actuators: Upper, Lower, Hand) |