There are several federal gun laws. If you walk into my store and tell me that you want to buy a gun so that you can kill Mr. X, and I sell it to you, I can go to prison. That is federal law. If I am a store owner selling guns, I have to make you swear that you are not a felon when you buy a gun. If you are, you have committed Perjury and can go to jail. The weakness comes since you are not a licensed gun dealer. If you then sell the gun to a felon, there is no requirement for you to make the guy swear to anything.
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There is more than one law, but the basics are: you must be at least 21, you cannot have felonies or certain misdemeanors, you must be mentally sound, and a few other restrictions.
Violates federal law
That would depend on the charge, and whether you are convicted of the charge. This is governed by Federal law, not state law. Gun dealers are licensed by the Federal government.
Depends on the law of your state. It is not required under Federal law
Not in the US. Federal law.
Federal law says you must be 18 to buy a long gun
State law may allow gun and ammo possesion for convicted felons, but Federal law does not.
under FEDERAL law, yes. Under state law- maybe.
* Federal law is 21 for handguns and 18 for long guns.
Federal law is 21
Yes- Federal law,
Your problem is not Colorado law, it is Federal law, which takes precedence over state law. If you have been convicted of a crime of domestic violence, Federal law prohibits you from possessing a gun. I'm sorry, but there IS no time limit- it is permanent.
No. Many states have "safe storage" laws, but there is no Federal law on this subject.