Click to take the rifle. Mouse aims, left button fires, right button looks through the scope. It is a bolt action: five rounds, a moment to work the bolt between them, then R to reload. Your aim breathes; hold SHIFT to steady it for a few seconds. WASD walks the outpost.
Bullets drop and the wind pushes them: at two hundred metres you are aiming a body height over the target and a little upwind; the number under the crosshair is the range to whatever you are pointing at, the dial shows the wind. Rovers drive, heavies crawl and drones fly; anything that reaches the outpost costs a life. The sun goes down as the waves come, the headlights come on, and when it is dark, it is over.