>So, why is in your opinion the AR-15 platform "military grade", and the hunting rifles available in Portugal not? Knowing that both platforms have been used by the military in combat situations, and knowing the hunting platforms usually have much more powerful cartridges?
This is a question you'd need to ask to the portuguese authority that manages weapons importation at the customs, which curiously, it's a procedure that must be done in the presence of a customs oficial, an expert of the Police (PSP), and the General Management of Weaponry and Defense Equipment (Direcção-Geral de Armamento e Equipamento de Defesa).
So I think it's their opinion and expertise that dictates such decisions? No idea! But I don't see it written anywhere that such specific weapon/platform is banned/forbidden.
Curious fact, just came across this information, apparently not so long ago civilians could buy fully automatic rifles in Portugal
, you just had to belong to a "club"! It was one of the few countries that allowed that, like Pakistan an Yemen - I had no ideia just found this out. Law changed from pressure of EU and UN.