Sitting on Gonghexin Lu in Hongkou, K-7 is a gritty, medium-sized converted basement garage set up with plyboard mazes that they rearrange sometimes. There's no aircon, the lighting is strict fluorescent, and there isn't any music. They have two set-ups: one is a P90-looking thing that comes in small (6-7 year old friendly) and big (with recoil effect). They're linked to a helmet and nothing else, so only headshots count. Another is a realistic looking AR-15 sort of gun with hit-detectors on the torso and helmet.