Looks like in PA it needs ta go through a FFL.
18Pa.C.S.6111
If in Pa, all handguns need transferred.
Except, within immediate family. (Mom/Dad/Kids)
Even need transferred to a step child.
Unless step dad was to give it to his wife.
She could then give it to her kid.
Or, her parents or siblings
Long guns don't need transferred.
Do you know a mom/dad/kid/spouse of the dead dude?
Or, is it a rifle?
