In most U.S. states, there is no registration.
Since they are not registered, there is no way to answer your question. In the US, MOST guns are not registered- there is no law requiring that guns be registered. It is a popular misconception that there IS such a requirement, but there is none on a Federal level.
IIRC, they were all legal.
No
No.
http://www.nraila.org/GunLaws/nyc.aspx
Like most of the US, there is no registration of guns in Texas.
No- see link below.
You cant'.
No, but gun owners do.
Many places don't require it.
It depends on the country where you live. Where I live pellet guns don't have to be registered.
Depends on what registration process (if ANY) is used where you live. In MOST of the US, there is no registration of ordinary rifles, shotguns, or handguns.