Wes, since you are a Ky resident & only in Md as a visitor, to fully comply with BATF regs you must sell them through a licensee just as if you were shipping them. Legally, a private party transfer of handguns can only take place between residents of the same state. Not so with long guns unless either state prohibits it by law. I would imagine private party handgun transfers between non-residents take place all the time. But woe unto them what gets caught.