Oh dear..

[Tribesman]

MP5's are H&K guns, so German,
British Aerospace/Royal Ordinance owns H&K , so British

IIRC they have a plant in Turkey that they used to get around the EU embargo against the warring ex-Yugoslavia.
They have many plants and licensing agreements worldwide .
One of their usual methods of getting round EU arms embargos is to manufacture (but not assemble them) within the EU . send them to Switzerland for assembly , then re-import the finished weapons from Switzerland and ship them on to their final destination , often transhipped via another non-EU country to further avoid any accusations of sanctions busting .