This is a federal law and applies to all states.

GUN CONTROL ACT OF 1968

Title I prohibits dealers from selling any firearm or ammunition to any person who is:

a. convicted of or under indictment for a felony

b.a fugitive

c.adjudicated as a mental defective or who has been committed to any mental institution.

d.addicted to or an unlawful user of marihuana or a stimulant, depressant, or narcotic drug.

e.less than eighteen years of age for the purchase of a shotgun or rifle

f.less than twenty-one years of age for the purchase of a firearm that is other than a shotgun or rifle

g.a non resident of the State in whichthe licensee's place of business is located

h.an alien illegally or unlawfully in the United States

i.dishonorably discharged from the armed forces

j.subject to a court order that restrains such person from harassing, stalking, or threatening an intimate partner

k.convicted in any court of a misdemeanor crime of domestic violence

I'm 99.9% sure the law states that a felon can not own a firearm, and not all guns are firearms, like muzzle loaders for instance. This was personally told to me by G. GorXXXXX XXXXXddy and I think he would know. It is infact a federal law so the individual states have no say in it.