Do I need a certificate for an air weapon?
Conventional air guns, air rifles and air pistols do not need to be held on a firearms certificate unless they are of a type declared specially dangerous by the Firearms Rules 1969.
The rules classify any air weapon as specially dangerous if it is capable of discharging a missile with a kinetic energy in excess of:
Air pistols - 6ft/lbs
OR
Any other air weapon - 12ft/lbs
It is possible to measure the velocity of the pellets discharged with an electronic chronograph. These measurements allow the calculation of the kinetic energy of the pellet at the muzzle.
Weapons exceeding these prescribed limits can only be lawfully held on a firearms certificate and are subject to all rules and regulations concerning section 1 firearms.