An antique firearm is not defined in the law but guidelines from the Home Office suggest the following may be considered as antique:
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A muzzleloading firearm of original manufacture (not a modern made replica or reproduction).
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Any breech-loading firearm using a rim-fire cartridge exceeding .23 (but not 9mm).
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A breech-loading firearm of original manufacture, using an ignition system other than rim-fire or centre (e.g. flintlock or percussion.).
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A breech-loading centre fire firearm originally chambered for cartridges, which are now obsolete AND retaining that original chambering.
There is a further requirement that any 'antique firearm' is kept purely as a curio or ornament not to be fired and for which no ammunition is authorised.
If modern ready-made ammunition can be readily acquired and used the weapon may not be considered as an antique.
If a person wishes to shoot any antique firearm or shotgun it must be shown on his certificate and properly recorded with the police. However, each case should be dealt with on its merits and advice on individual weapons can be sought from the relevant force's firearm department.