Sometimes the simplest things are the most effective. Metal bones let you hit things really hard.
Titanium Rods is an augment; when an agent with Titanium Rods installs makes a melee attack, it deals +1 KO damage. The effect stacks with other instances of Titanium Rods installed on the same agent.
Titanium Rods is available from some Nanofabricators for 400 credits, or from some Augment Grafters.