This doesn't exactly belong, but I figured you guys might be interested, and Paul might want to add it to his page.
https://youtu.be/iQxwVY7ziKs part 1
There are 5, each about an hour long, and pretty technical. It's the... 'reproduction/redesigned from the ground up/modernized' stg-44 with caliber interchangeability: 5.56,7.62x39,.300 blackout, and the original 8mm kurz