See the link below for the UK air gun laws.
Sportsmarketing in Essex sells C02 air guns
No they are not but you need to be 18 and you need proof of age such as a drivers license
it depends on the country and location where you live
All Co2 tanks will fit any gun meant to be powered by Co2.
No
Read the directions for YOUR gun. CO2 does not explode, but may leak down.
CO2 powered weapons are usually fitted with a removable cartridge - which is stored in the handle of the gun.
No
yes. A flare gun is not considered a firearm. Do not attempt to change one into a firearm.
An air-soft gun that is powered by CO2 or green or red gas instead of a spring or a battery.
Pain is different for each person. But in general, CO2 Powered would be more painful. Because of the constant speed of it in general.
First off, It's B.B. not bebe gun and if you commit a crime with it being reresented as a real gun it is considered "a real firearm" other that that I would check with your local police to see if there are municipal restrictions.
Define real? If you mean like a actual gun which shoots bullets, no. If you mean real as in not fiction, yes. There are several CO2 powered rifles, such as the Beretta CX-4 Storm which is powered by a 88 gram CO2 cartridge.
No it is not a toy. In some countries it is considered a firearm. In the USA it falls into a grey area. Not quite a firearm but not a toy.
No you do not need to put air in an airsoft gun. These guns are either spring powered where you must cock the gun before you shoot it, electric powered which are automatic and require batteries, or CO2 powered which requires a CO2 cartridge. This CO2 is not expensive and a pack of 40 CO2 cartridges costs only 20-25 dollars. the guns that require CO2 are not as common as the other forms of airsoft guns, although they are more powerful. In general, if you buy an airsoft gun, you do not need to put any air into it.