I had my record expunged can I now buy firearms?

I got arrested in NJ for drug possession and it got ruled down to a disorderly persons offense. I received PTI. I got my record expunged and I now live in PA with a PA license of course. I want to know for sure 100% that I can buy a shotgun in PA for hunting? My lawyer is a NJ lawyer and he said he was not sure in a other state.