The Warhammer (WHM-6R) is the best & most deadly non-hero heavy mech in Mechwarrior 5 Mercenaries, because it is able to engage targets from far, doing good damage, and never stop shooting when in close range, melting any enemy. This video will show you the Warhammer in action, and how to build the mech from the ground up.

Let me know in the comments below whether you use the Warhammer as well, or whether you have a better heavy mech for MW5.