from BA website

All firearms (including replica and decommissioned) and ammunition are restricted under UK law and may be carried only with advanced notification and with the appropriate licences and documentation.

There is a limit of 5kg (11lb) of ammunition (cartridges for weapons, small arms) per person from the IATA Division 1.4S category (UN numbers 0012 and 0014) only. It should be for that person’s own use only and excludes ammunition with explosive or incendiary projectiles. Allowances for more than one passenger must not be combined in baggage.

If you are planning to make a booking on ba.com that includes a flight operated by an airline other than British Airways, please contact us before booking to check that the other airline is able to carry your firearm. You will not be able to take any firearms, including sporting rifles, on flights operated by Comair.

Each case containing firearms or ammunition is subject to a £50 charge at check-in each way to cover the cost of our specialist firearms and ammunition handling partner.
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Notify us before you fly

You must call one of our contact centres at least 72 hours before your flight if you intend to travel with firearms or ammunition to ensure compliance with government embargoes and restrictions. If you fail to notify us you will not be able to travel with your equipment.

You’ll be asked to specify:
•the quantity of firearms you wish to transport
•the type (handgun, rifle, shotgun)
•the make/model and calibre
•the quantity (in weight) and calibre of ammunition
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Documentation

All passengers intending to travel with firearms or ammunition must ensure they have the required documentation and licences for them. This includes export/import licences and authorisation from local and national authorities.
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Checking in

You must arrive at a check-in desk at least two hours before your flight to allow sufficient time to process the paperwork prior to clearing security. Groups or individuals travelling with 10 or more firearms or boxes of ammunition must allow at least three hours.
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Transferring through London

If you are transferring through London airports you must allow a minimum connecting time of three hours between flights.
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Preparing your firearms for travel

Firearms and ammunition will be accepted provided they are packed in an appropriate carriage case, or if this is not possible, packed securely inside a suitcase with your personal effects (except on flights from South Africa and Italy — see below). Please also ensure that:
•Each firearm carried is accompanied by the appropriate firearms certificate.
•The firearms are unloaded.
•Ammunition is packed in either its original packaging or in a suitable container that prevents movement between shells or cartridges (i.e. loose ammunition is not permitted).
•Bags with ammunition do not bear “explosives” labels.

Extra and overweight baggage charges will apply if any bag exceeds the weight limit or your total baggage including firearms and ammunition exceeds your free baggage allowance.

See our extra and overweight baggage charges
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Packing requirements for South Africa and Italy

Firearms and ammunition are not allowed in hold luggage with general personal possessions on flights departing to and from South Africa and Italy. All firearms have to be packed separately from the ammunition and must be in a locked firearms case. The ammunition must be separate and in its own locked bag or container. In these instances you will not be charged an extra baggage fee if you exceed your free baggage allowance.
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Packing requirements for Romania

Firearms and ammunition are not allowed in hold luggage with general personal possessions on flights departing from Romania. All firearms have to be packed separately from the ammunition and must be in a locked firearms case. The ammunition must be separate and in its own locked bag or container.