I know i've heard it a million times otherwise, but i am trying to figure out what makes this wrong:

PA Title 18 section 6111:
Code:
        (c)  Duty of other persons.--Any person who is not a licensed
     importer, manufacturer or dealer and who desires to sell or
     transfer a firearm to another unlicensed person shall do so only
     upon the place of business of a licensed importer, manufacturer,
     dealer or county sheriff's office, the latter of whom shall
     follow the procedure set forth in this section as if he were the
     seller of the firearm. The provisions of this section shall not
     apply to transfers between spouses or to transfers between a
     parent and child or to transfers between grandparent and
     grandchild.