I'm sure I'm in the minority, but I'd rather off myself than wait it out and freeze to death 36 million miles from the closest human if I missed an orbit loop.
Landing in the wrong location on earth, being found by some aboriginal tribe, I'd want a gun. There would likely be jets and helicopters there before some painted fellow with a pointy stick, but it couldn't hurt.
But basically I'd want a gun simply by principle. The Second Amendment should be spread to the rest of the universe, since it has yet been actualized on Earth in my opinion.
And cool it with all of the IBTL nonsense. This can be an interesting, humorous, and insightful topic. Hell,
this thread made it five pages and got
quite technical. One note of interest was that while solar radiation (I think) keeps exposed surfaces at a relatively tolerable temperature, unexposed areas, such as the chamber, trigger mechanism, etc. will likely cool to extremely low temperatures, making failures highly likely.