None. When made, 99.9% are legal, no matter where made. Just because it's against the law for YOU to own it doesn't make the weapon illegal.
Technically the above is correct however as guns are not required to be registered in all states it is impossible to say how many are owned legally. Guns that are owned illegally are obviously not registered so there is no way to know how many there are.
Not in the US, but registry is required for ownership or possession of certain types of guns.
Spud guns are generally legal in the US. They require approval from the BATFE.
There are no states in the US that require a license.
Illegal firearms are very rare, compared to the number of legal firearms in existence. Roughly half the households in the US own at least one firearm legally.
Depending on where you are, guns are NOT illegal.
Cap guns are illegal in Rhode Island.
BB guns and airsoft guns are legal, but it may be illegal to transport them, especially to handle them if they are looking like 'real' guns.
bb guns r illegal in North Carolina
Matters what period of time you are talking about.
If suppressors for real guns are then most likely. since they're illegal in the US I'm guessing they are in Canada as well
Yes, of course it is illegal to bring BB guns on planes.
By the local ordinance in Baltimore city are BB guns illegal