Airsoft is almost exactly the same in every country. The small differences you may find often depend on local laws. In Russia, when you play in an outside field, the power limit is 500 FPS (with 0.20g balls), but if you play in a building, you can use a maximum of 400 FPS, and 600 FPS with bolt snipers. There is no restriction for full auto shooting or for head shots ;-).