A deactivated firearm is one in which as undergone a conversion process so that it will no longer fire. Deactivation is intended to be permanent, where reactivation cannot be done without specialist tools or skills. Within the UK deactivation work must be authorized by a proof house, where a certificate of deactivation is granted if successful. The requirements for a proofed deactivation where increased in Octorber 2005, as the extract bellow from Arundel Militaria shows.
Deactivated firearms that have been proofed do not require a firearms licence and are legal within the UK.
Blank Firing Firearms
A blank gun is a gun designed to only allow the firing of black cartridges, and will not allow the firing of a projectile, although blanks can discharge hot gasses and fragments of the casing or substance used to crimp the opening where the bullet would sit on a standard cartridge. There are several well known uses for blank guns, or standard firearms that have can be used for the purpose of firing blank cartridges. These include, military training, The T.A being a famous example, blank guns are also popular as starting pistols and are used by reenactment groups and in the film industry.