I would imagine with the arms trade flooding Europe with tools of war, plenty is being siphoned off in the staging countries like Poland, etc. which will eventually make their way throughout Europe.
China, Iran, others.... etc. would be more than happy to flood Europe with arms in the event of a ‘civil war’. Qhadaffi was THE major arms supplier of the IRA in the 70’s.
I think with all the sanctions the EU put on Russia a few AK-47s might find themselves being flooded into Western Europe