I would still proceed with caution, there can be city and county ordinances which can get you into hot water...he is best off printing the state code out and swing by the local PD or sheriffs office to confirm this (though sometimes they wont even know, but if they tell you its illegal even if it is legal you know the local cops will bust you for it).
Best to play it safe, even if the charge is only a misdemeanor it could effect your career or future choices...I like the lever lock autos because most police wont think a second thought on something that looks like an old slip joint.