The second exclusive Federated Suns BattleMech, the Hammerhands was developed in 2475 after a decade reviewing the performance and complaints received about the earlier BattleAxe. Little more than a heavier and slower version of the BattleAxe, the design received its name based on the impressive weapons carried in each arm, serving to trigger the Federated Suns' seeming love affair with autocannons. Much like its sibling design, the Hammerhands went on to influence and be outdone by the immensely popular Warhammer, causing it to fade into history, all but forgotten.
During the Jihad, both Achernar BattleMechs and the New Hessian MechWorks production plant started producing Hammerhands for the AFFS. Production continued after the end of the Jihad. [Source: sarna]
You can download the papercraft model here: Classic BattleTech - Hammerhands Free Mech Paper Model Download