In most states face to face transfers are fine as long as both parties are legal residents of said state and aren't a prohibited person for any reason. IE, if it's illegal for you to buy a gun in the store, you can't buy it from private parties either(you're felon or something etc etc). Here in NJ you need a handgun permit but you're fine as long as you have it.
If you need a handgun permit in Maryland (beats me) to buy a handgun, you'd both still need them.
Sig 1911 Traditional reverse two tone, Sig p226 .40, Sig 556 Swat patrol, Baby Eagle/jerico steel .45