Spanish National Police arrested the suspect in the village of Casarrubios del Monte for possession, production and sales of illegal weapons, authorities reported on Tuesday.
Officers at the suspect’s house found over 200 illegal weapons, including flick knives, daggers, knuckledusters, pepper sprays and tasers camouflaged as mobile phones, with the latter being the biggest weapons online.
Police did not reveal the suspect's age but did report that he was under 18.
According to their statement, the minor manufactured his own knuckledusters using various moulds.
His selection of knives also had SS and Nazi inscriptions on them.
Spanish police believe the suspect sold most of his weapons on a website he had set up, which the investigation team first came across in February.
The young man has continued in the tradition of Toledo’s weapon craftsmanship, as the medieval city is known as the sword and knife capital of Spain.