Fact - In the state of TX you can carry a handgun in your vehicle, as long as it is completely concealed, without a permit. For all you military folk, this does not apply on base. Exercise your second amendment rights, and protect yourself. BTW I have a number for a good Concealed Handgun Class for TX if anyone wants it. By the end of the class you have everything you need and just have to mail your package in.
There are many states in which you are allowed to do that. As far as I know, Wyoming and Montana are both like that as well--Wyoming, at least, definitely allows carrying of unconcealed weapons in every case except in an establishment that serves alcohol. In California, from what my uncle tells me (he is and ex Sheriff's depute in the Sacramento area of 30+ years), although there are restrictions on what weapons you can carry and there's a waiting period and all that, you can still carry an unconcealed weapon around with you. Also you can buy any of them at 18.
In Wyoming you can buy just about anything without any restrictions, besides the federal restrictions on automatic weapons and military grade artillery. I used to work the gun shows with my ex girlfriend in Cheyenne, and you could walk in and buy all sorts of guns and walk out with them without any kind of waiting or paperwork. Only real catch I noticed in Wyoming is that you have to be 21 to buy handguns, however you only need to be 18 to buy any long barreled weapon (shotguns, rifles, etc.)--however you can
possess any long barreled weapon at any age, you just have to be 18 to buy them.