PDF, Page 203, Steiner Anti-Infantry Unit:
The unit's range seems to be calculated using the Primary Weapon's range. However, it has 2 Secondary Weapons per platoon, and the Firedrake Support Needler, which has a base range of 1. Which means the range should properly be: –1 (0 Hex), 0 (1 Hex), +2 (2 Hexes), +4 (3 hexes).