I know in Pa you can not get your charge expunged if you pleaded giulty to it.To get expungment you have to go before a judge and explain your case and they decide if theyre gonna expunge it or not. And you can not get violent crimes expinged.
Sign unseen this question cannot be answered since there are WAY too many things about Uzi's that COULD be in violation of the FFA, let alone Pa's laws. Best bet - bring it to your local FFA-licensed...