believe in most european countrys it would be an illegale made of explosive material. here the main ingredient salpetre is restrictet but until 2002 you could buy it free.
it was in the aftermath of the 9/11 terror hysteria that this stops. I bought it before to make nitrated paper for paper cartridges. I would say any material you can use directly to make explosive is now highly restricted in europe so we have seen wannabe terrorist without connections making explosive devices with blackpowder from firework until this is also forbidden one day.