You may be having trouble coming into OWNERSHIP of a pistol, but that shouldn't stop you from POSSESSING a pistol. Just be honest and say it belongs to your father who knowingly of course loaned it to you. You are likely to spend some time at some point with an officer while he educates himself on the law he or she is paid to know and enforce... That's happened to me under different circumstances.
As far as I know there is no limit to how long a handgun can be loaned to you, or how far away you are from the owner.
Hope that helps.