General manufacturers: ammo not available anymore

[Convair880]

The schematics are unfortunately still broken, and it would be nice to have an alternative source of ammo again. It would be appreciated if a coder could have a look at this bug.

Manufacturer: Schematic "/datum/manufacture/stunrounds" not found
Manufacturer: Schematic "/datum/manufacture/bullet_22" not found
Manufacturer: Schematic "/datum/manufacture/bullet_smoke" not found