I’m gonna build one of THESE:
That’s the shoot house we played in on Sunday. AR500 plate walls, movable interior walls also lined with AR500 plate with a plywood skin on the surface, hollow-core doors, and portable bullet traps:
These are constructed of AR500 plate with a piece of what looks like rubber conveyor belt over the open side of the box that traps the splashed particles of the bullet after it penetrates.
If I had unlimited wealth, I would have a shoot house on my property.