It might be a shop that sells classic guns which are not in working condition.
The current legislation in EU permit to buy such items from various countries and easily make a working
Kalashnikov.
Check Slovakian and German AK.
This item is legal in EU and banned in USA:
I find this very scary because if this is possible what is not possible these days, I think this shit is over the top because this can really kill people.
I once saw someone selling the useful stuff knifes and all of that kind of things but I never thought it would go this far.