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I usually keep a handgun in my truck (2005 Toyota Tacoma) secured in a Console Vault http://www.consolevault.com/" onclick="window.open(this.href);return false;

G27 is a good choice for vehicle gun, IMHO, for same reasons it's a good gun for concealed carry. Small enough to stash out of sight, powerful enough to get the job done, reliable, and able to withstand some adverse climate conditions.

I also like snub-nose revolvers for vehicle guns for same reasons. If you need to carry a vehicle gun on your person for some reason, just slip it in your pocket. Of course you SHOULD already have another gun on your person. But sometimes if just making a quick run to the store, knowing I have the truck gun that I can just lip in my pocket means I don't have to bother "suiting up" at the house. This is why I use a smaller truck gun than others - who will use a full-size pistol or even a shotgun or rifle.

If you prefer using a full-size handgun as a vehicle gun, I've read a lot of posts on this forum of people using the relatively inexpensive and durable S&W Sigma guns (about $300 new at Academy) - or just about any medium- or large-frame 4-inch barrel revolver would work well too.

Have contemplated keeping a rifle or shotgun in bed of truck (under lockable hard bed cover), but haven't done so yet. Seems this would be more important if you find yourself in fairly remote areas and might need to engage a wild animal of some kind, for example a rancher needing to scare off a coyote.