Most fun you can have with your clothes on.
That stage that she was shooting started with a stage gun (a gun that every competitor uses to shoot the stage).
We do not have full-auto stage guns at every match.
That was a stage sponsored by Remington Defense, and that is one of their products.
Matches are divided into "stages", or "courses of fire". There may be 4-6 in a local match, 10-12 at a big, multi-day match. They vary, depending on the facility. Sometimes in a bay with berms, sometimes open terrain like that one.
RickB had the equipment summary. I will clarify by adding a single optic is allowed on a rifle; adding an optic sight to a handgun or shotgun puts you in Open where the equipment cost outlay is substantially higher.