Fires can't burn in the oxygen-free vacuum of space, but guns can shoot. Modern ammunition contains its own oxidizer, a chemical that will trigger the explosion of gunpowder, and thus the firing of a bullet, wherever you are in the universe. No atmospheric oxygen required.
Well, it would simply drift into the blackness, forever alone, while the galaxies around it sped further away. Those galaxies are travelling at around 200km/s (124 miles/sec) as the Universe expands, whereas a travelling bullet can reach speeds of only 1km/s (0.62 mile/sec)
Bullets shot in space wouldn't really travel any faster than they would on Earth, though they could travel farther. ... In space, where there is no gravity, your bullet could keep moving forever as long as it doesn't hit something — like an asteroid or a planet..
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