The FGC-9 is a 9mm semi automatic firearm which can be made using a $200 3D printer, some hardware store bits, airsoft toy spare parts, and a length of steel tubing for a barrel. It also uses a printable Glock 17 30rd magazine.
A homemade double barrel 20-gauge shotgun which was seized from a drug dealer in Brazil last month. The top barrel is trigger fired while the bottom barrel is fired using a thumb to flip down the striker.
An extremely crude homemade .380 ACP submachine gun design adopted by illicit gun makers in Brazil. Most feature the use of barrels and bolts made from brass bar for ease of cutting drilling. The mag catch is usually nothing more than a nut and bolt. A large number of similar weapons were being made in a factory raided back in 2016, with such guns being traded through a WhatsApp group for the equivalent of 1000 USD.