I remember seeing something on the history channel about 30 years ago. The armorer basically said the tolerances were so bad on the manufacturing no two were alike, everything had to be customized to function, and that open sided magazine was one of the worst ideas ever conceived.
Oh I meant this crap. The gas station I mainly go to has a live feed running on the pumps 24/7. I assume they get a kickback for it.
https://www.cheddar.com/
Certainly they are too big to fail.