There seem to be quite a few of these in Brazil. From Impro Guns: Printed SMG – Brazil- 02/10/25
Seized following a shootout with police
Click thru for the photo. It isn't clear, but it appears to be a variation on the FGC-9. It uses some 3D printed parts, some metal parts, such as steel tubing for the barrel, and can either use Glock magazines, or you can 3D print those magazines.

When I was a kid I read the 1951 book "The Weapon Shops of Isher" by A.E. van Vogt, and it stuck with me throughout my adult life. It is about an oppressive galactic empire and what happens when common citizens get access to weapons. I may have to go back and re-read it, it seems to be an idea whose time has come... again.
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