Team Fortress 2 has the following lines in Crafting Items menu:
- Smelt primary weapons (2 of the same primary weapon)
- Smelt secondary weapons (2 of the same primary weapon)
- Smelt melee weapons (2 of the same melee weapon)
- Smelt class weapons (2 weapons used by the same class)
All these produce 1 Scrap Metal.
So, why are the first three items needed, if 2 of the same weapons are always used by the same class anyway?