It depends on where you are, but the short answer is, you can't. In the U.S. most states do not require registraition, and in the few that do, the information isn't available to the general public, and there is no federal registration.
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Actually, there is a federal form that everyone from every state has to fill out when you purchase any firearm from a federally liscensed dealer (gunshops) That is form 4473.
The dealer has to keep the form for 20 years. The forms must be surrendered to the ATF when you go out of business if it is before the 20 year period.
In other words, the dealer you bought the guns from can tell you which guns are registered to you if he is still in business.
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The 4473 form is not the same thing as registration, and any guns that are bought and sold between individuals don't require a 4473 in many states, so the answer to the original question still is, you can't find out what guns are registered to you, because there is no federal registration, and most states don't require it, and in the states that do, the registration database isn't available to the general public.
You cant'.
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.
Commit a gun related felony...
Not unless you are a LEO and have a valid reason to know.
No.
No
It depends on what you mean. There is no national registration in the U.S. and most states don't require registration.
Like most of the US, there is no registration of guns in Texas.
No- see link below.
No, but gun owners do.
Many places don't require it.
In most U.S. states, there is no registration.