kinda weird story. my brother who I haven't seen in YEARS because of his choice to use drugs and abuse alcohol from his early teens messages me on facebook asking me to go eat dinner with him but and the end of the message he says "whether you go or not let me know if you can get me an M-4 that's not dirty". this set my spidey senses off so I go show my mother who has been trying to get us together for awhile and she tells me he owns a shotgun to which I say I'm not sure he can own any firearms do to his MANY run ins with the police and arrests(not sure if any are felonies) and the fact he is on many anti psychotics for mental issues. she says he can own a shotgun just not any handguns. so my question is are there any laws regarding being able to own certain types of guns but not others? because I would think if he's not allowed to own handguns he would not be allowed to own any other type of gun. thoughts, answers, bacon?