Yeah, a lot of that equipment has to be Soviet machinery. It's a production line from the Cold War, only difference is they're now churning them out for the commercial market rather than the glorious People's Republic.
You can get these mags for about $11 each. There's another video where they drive over them with a tracked APC, load them up and fire them. Rugged SHTF mags. I'm on an ammo and mag buying spree now. A case a month and several mags. You just know they're preparing a new line of attack on the 2nd.