MarkItZero
Member
Sold under a ton of different names but they actually work pretty well. I'm really unsure of how they could be produced this cheaply.
https://www.classicfirearms.com/armelegant-ang10-semi-automatic-ar-12-shotgun-18-barrel-12ga-3-2-5rd-detachable-mag/
https://www.classicfirearms.com/armelegant-ang10-semi-automatic-ar-12-shotgun-18-barrel-12ga-3-2-5rd-detachable-mag/