“The National Police has reported Operation Saguaro, which has involved the arrest of a man in Abegondo, province of La Coruña. This individual had a clandestine weapons printing workshop at his home that he “manufactured” thanks to three 3D printers that have been found in it. He also had plans for its elaboration.
As part of the operation, Police seized an AR9 submachine gun. in an almost finished state, assembled with 3D printed parts using the seized material. Those in charge of the operation have been agents of the General Information Police Station, collaborating with the Provincial Information Brigade of A Coruña, and directed by the Investigating Court number three of Betanzos.”
The improvised zip gun built and used by 41 year old army veteran Tetsuya Yamagami to assassinate former the former Japanese Prime Minister appears to be muzzle-loaded and electronically initiated. It appears to consist of two threaded gas pipes with end caps drilled to enable insertion of a wire which may be connected to a broken bulb or improvised electric match filled with black powder or match-head shavings to initiate a main propellant charge. Loaded in front of the charge would typically be paper wadding followed by ball bearings or other projectiles. A similar improvised muzzle loading gun was used to kill a police officer in South Korea in 2016.
Edit: More improvised firearms have apparently been found at the suspect’s home:
A typical favella narco gang loadout. The ‘General’ gets to pack the MAC knock-off where as his lowest ranking Lieutenant must work his way up to earn the privilege of getting a magazine for his ‘MADE AS ISRAEL’ Tec-9.