Some BattleMech designs earn a place in history because they are the chariots of heroes. Some, like the Black Heart, because they are the chariots of monsters like the Word of Blake's elite Manei Domini.
The Black Heart carries a pair of Light Gauss Rifle for long range attacks, supported by a pair of ER Medium Laser for medium range, and several sets of SRMs for short range attacks. [Source: sarna]
You can download the papercraft model here: MechWarrior 4 - Black Heart (MekTek) Free Mech Paper Model Download