PA laws need review also
The seller may have hoops to jump through also. He should consult the laws of PA governing sale of handguns between private citizens. In CT, for example, also just a short hop to NY, I have to verify a purchaser's eligibility to receive the handgun and file paperwork with the state immediately upon sale. I may also have to run the NICS check, although i don't know how.
Another example of the ridiculous patchwork of different and conflicting firearms laws from state to state that cries out for standardization, just like concealed carry.
Of course, none of these laws apply to criminals who would simply purchase the handgun off the record and bring it back home. I sleep better at night knowing these laws keep us all safe from the other law-abiding citizens and fellow lawful gun owners.