In the United States, the requirement for a license to sell firearms varies by state and federal law. Generally, if you are engaged in the business of selling firearms, you must obtain a Federal Firearms License (FFL) regardless of the number of guns sold. The Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) defines "engaged in the business" as selling firearms with the intent to make a profit, which can include selling multiple guns over a period. It’s essential to check both federal and state regulations, as they can differ significantly.
NOPE
No, you do not need a licence for airsoft guns in the US.
Yes, but you need a licence and this is difficult to obtain. You have to be 18 and you can only get a gun licence for sporting purposes.
You need a licence to purchase one
There is no licencing anywhere for airsoft guns.
Yes, you do- air weapons in the UK require a firearms licence.
Yes
Yes, Black powder guns are extremley dangerous a licence is definitely needed
Yes
Not many at all. VERY very few...only some criminals (as all other countries)
Yes - airsoft toy guns are federally classified as firearms in Australia, so you will need the same license as for a lethal weapon.http://www.airsoftaustralia.com.au/
In order to answer that, we would need to know where you are located, and what you mean by a gun licence. Do you mean a licence to possess (not required here, by the way) a license to carry, a licence to repair, or a licence to sell guns. Please rephrase your question, and give us enough information that we can give you a real answer. Sorry.