Air rifles which produce muzzle energy higher than 12 foot pounds and air pistols higher than 6 foot pounds at the muzzle, are classed as firearms and an FAC is necessary to possess them legally. If the gun is below the stated figures then no certification of any kind is required to either, buy, possess or use them. The onus is on the owner of the gun to ensure that it does not exceed those power levels. If the gun does exceed those levels, even if the owner is completely unaware of the fact, then the owner is guilty of illegal possession of a firearm.
People over the age of 18 may purchase and own low-powered air rifles and air pistols, and the ammunition for them, and use them, but only where they have specific permission to shoot.
People between 14 and 17 may borrow (but not own or purchase) low-powered air rifles and air pistols, and the ammunition for them, and may use them without supervision, on private premises where they have specific permission to shoot. People in this age group may NOT buy or hire an air rifle, air pistol or ammunition, or receive them as a gift. People in this age group may NOT have an air rifle or air pistol in a public place unless supervised by somebody aged 21 or over, AND have a reasonable excuse to do so.
People under 14 years of age may only use low-powered air rifles and air pistols on private property where they have specific permission to shoot, AND whilst they are under the direct supervision of someone 21 years of age or older. People in this age group may NOT buy, hire or receive an air rifle, air pistol or ammunition as a gift, or shoot, anywhere at any time, unless supervised by somebody aged 21 or over.
Any person on private property without permission is trespassing, and if that person has an air rifle or an air pistol, even a low-powered one in their possession, then they are committing the offence of armed trespass. It is irrelevant whether the gun is loaded or not, or even whether the person has any pellets in their possession. The mere possession of the airgun is sufficient for conviction. Armed trespass is a serious criminal offence carrying heavy penalties.
Air guns which make use of self-contained air or gas cartridges, where the gas or air propellant and the pellet or bullet are contained within a single self-contained cartridge are now prohibited. (The most common example was the Brocock revolver). People who owned such airguns prior to the ban in 2004 were permitted to retain them, but only if they were entered on an FAC. Even the ones held on an FAC may not now be sold, or even given away. The only permitted method of disposal is to hand them to the police for destruction. Possession of such airguns without an FAC carries exactly the same penalties as those for possession of other unauthorised firearms.