There are some old-school black and white videos on gun mechanisms that explain everything from the basics to how automatic/semi-automatic machine guns work, an

There are some old-school black and white videos on gun mechanisms that explain everything from the basics to how automatic/semi-automatic machine guns work, and they use large-scale wooden models. There is a little fluff at the beginning, but the style is very much the same and has similar models to demonstrate everything. For example: https://www.youtube.com/watch?v=GJzXG7MYX1c https://www.youtube.com/watch?v=GJzXG7MYX1c https://www.youtube.com/watch?v=CcVeslwTvAw https://www.youtube.com/watch?v=CcVeslwTvAw