[@Euphonium]
Yes you cann be from a separate nation and still work on the station even if you nation doesn't own a wing. Just say that you registered for the program through the U.N instead of your nations government.

The difference between between an engineer and a mechanic is that a mechanic has more knowledge on how to fix a vehicle and its engine. A engineer is better at making things from scratch and has the knowledge to fix things like a breach.

Nato (from what I can gather online) still uses this ammo type for this pistol.