Do Modern Firearms Work in Space? June,2012

I've been trying to figure out whether modern hand held weapons such as AR's, Pistols, Shotguns, etc. would work properly as intended in a zero G environment.
Would it matter what type of action the firearms use, and how that would effect their performance in space? Would all the components of a firearms work as intended in a Zero G environment, and if not, what kind of problems/failures would be encountered?
Is there a certain type of action/firearm that would work exceptionally well in a zero G environment?
Do Modern Firearms Work in Space?

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