yes, if you are in space at the time and have an air rifle, you shoot it out the window, you die because of the vacuum, but it is successful. you killed yourself but got a BB pellet into space. WEAR...
Space is said to be a vacuum, so without air their is no way to propel the BB so NO it would not be able to leave the barrel. Now if it's a C02 air gun then Yes the C02 would be able to propel the BB...