Ok, here's the deal.
You have an illegal barrel for the gun, unless the gun is registered with the ATF.
If the gun is only a semi auto (which at this point in time, I hope to God it is) you have to have a 16" (or 18" in a few states) minimum length barrel if it's a rifle. The gun needs to also be at least a minimum of 26" in length.
These are specs for semi auto carbines.
If you have a 10" barrel with a semi auto gun, it is illegal, and you need to get rid of it immediately, or at least get it far, far away from the gun.
Please spend some time in our library, as it explains all about how to keep yourself out of prison.
The library explains all about the legal issues of owning and operating may different types of Uzi's.
I hope this helps.