Would a gun fire in space?!

I was sitting in class, having absolutely no luck thinking of a blob post, when I starting to just think of completely random scientific questions I could ask myself. I turned to a fellow classmate and starting talking to him about a specific on in general. "Would a gun fire in space?" and if so "What would be the reaction?" So we got to thinking.

At first we thought that because there is no air, there could be no combustion to launch the bullet. Therefore, it would not fire, and it would simply do nothing. Yet, after doing a little research we came to the conclusion that it would indeed fire. A bullet is made up of gunpowder, which is made of a mixture of a fuel and and a oxidizer. Oxidizer = oxygen. So even with the absence of air, there is still air in the bullet. All forms of gun would fire in outer space. Except one, any pump action BB gun. The reason for this is that these guns use air that is pulled in from the outside (keep in mind there is no air in outer space, so this simply can't happen) to pressurize the barrel and then release it, as a result the bullet is released.

The second question was a bit easier. "What would the reaction be?". Since there is no air in space that means there is no air resistance. Without air resistance there is nothing to slow the bullet down. So if you were to shoot a gun in space, the bullet would be moving at the same speed no matter the distance. So at one mile the bullet would be traveling at the same speed in which it was coming out of the barrel. On Earth, there is gravity to pull a bullet down. So eventually it would just fall to the ground. In space however, there is no gravity. The bullet would fire in a strait line from the barrel. If nothing would to get in its path, it could potentially travel at the speed in which it left the barrel, FOREVER. Thats so cool :)