Parent Pages: Rules
Following a tradition inherited from AD&D, in this campaign setting characters can use weapons designed for use by any race within one Size Modifier of their own, so long as the character can meet the ST requirement. To use larger weapons, the Giant Weapons Perk (p. DF3:10) or Huge Weapons Perk (p. PU2:6) may be taken.
Additionally, characters may push this one Size Modifier further by wielding a one-handed weapon in two hands. This allows wielding the weapon, but provides no other benefit, due to the awkwardness of the size difference.
Real Life Justification: Children do things this way with tools designed for an adult, especially the two hands bit.