The same kinds and types which are outlawed by the Federal Firearms Act (FFA) which is enforced by the Bureau of Alcohol, Tobacco, and Firearms (BATF).
No they are not illegal.
potato guns are not allowed to fire projectiles. that would make them illegal, but you can have one
Adultery is not illegal in Arizona.
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
Yes, of course it is illegal to bring BB guns on planes.
By the local ordinance in Baltimore city are BB guns illegal
No
They are illegal in Arizona sorry
No.