[Richard-SIA]

Proof of citizenship IS already required to buy a gun.

I am a gun dealer and manufacturer, take a look at the form 4473 that firearm buyers fill out. It ask about citizenship status several times!

[coloradan]

Acually, I thought it asked "are you a citizen, or have you been legally in the country for 90 days or more?" Legal aliens are allowed to buy guns; they are also allowed to buy hunting licenses. However, AFAIK, INS doesn't show up when someone fills the form wrong. Neither, for that matter, does FBI or anyone else, despite how easy it would be to make the arrest - which was the point of my post.