The technology available in Transhuman Space permits the construction of effective non-metallic weapons from such materials as glass, plastics and ceramics. Low-tech, low-detectability weapons might also be supplemented by certain combat orientated bio-implants. The Blackcollars in Zahn’s books had enhanced speed and reflexes.
Rubber Hand Catapult (TL6)
Update! Since first writing this I have found there is a slingshot stat in HT4e p.201. I have added these in red in the table above. Skill to use is Bow (Slingshot)(DX-5 or Bow-4). Bulk is -2 and folding models are Holdout -1. A lead or steel pellet costs $0.1 and gives +1 damage and double range. The handle of a catapult can be used as a yawara stick.