I live in a country were firearms are illegal

I'll assume you mean illegal to carry / use as a tool intended for self defense.

Because we do have a fairly large pool of weapons in this country - counting hunting weapons alone, there is about 1.1 million in a population of about 8.8 million.
To that you need to add the guns used for target / sports shooting (haven't found a number), the guns that are stolen each year (mainly hunting weapons from homes, as the control of military weapons in storage has improved the last years) and the weapons smuggled into the country (mainly from the old east bloc countries).

/Michael