Power limit for France non licence is 8ft pounds, UK is 12ft pounds, Airarms like the S200 are adjustable easily, up for use down for being checked, easy to monitor, sighters over same distance, and adjust to suit. The bottles for filling are not any old bottle, they come in various capacities and costs, they have to be certified safe every five years, not unusual for the bottle to come back from a check which you pay for to find a grinder has rendered it useless due to inner faults which develope with use. Look on sites for UTTINGS or YORK GUNS or PICKERING GUNS all three reliable dealers who can supply everything you might need.