Can you kill someone from an ordinary gun in space? Will it be able to shoot?

I mean weapons like M4A1, pistols, rifles, shotguns, machine guns.

How will they behave in open space?

My thoughts are these: because there is no air, gravity and tension then the bullets either won't fly out or they will just glide through space without much force to penetrate anything. So definitely guns and bullets won't work in space.

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    $\begingroup$ Research..... I mean honestly, what makes you think this would/should not work? $\endgroup$ – dot_Sp0T Jul 12 '18 at 5:54
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    $\begingroup$ Also, worldbuilding.stackexchange.com/questions/89557/… explains why they would normally still work. I'm also pretty sure this is a dupe of a question that was asked better on this site, I just can't find it right now. $\endgroup$ – Aify Jul 12 '18 at 7:19
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    $\begingroup$ The main issue with using firearms in space is vacuum welding of the components, and differential expansion of the metal and plastic parts exposed to direct sunlight or being in shadow, preventing the mechanical parts of the gun from working. The rounds will fire normally and have the same effect. $\endgroup$ – Thucydides Jul 12 '18 at 10:48
  • $\begingroup$ Has this ever been tried in real life? $\endgroup$ – SovereignSun Jul 13 '18 at 6:03
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    $\begingroup$ Yes, a Soviet era military "Almaz" space station, operating under the cover name "Salut 3", was armed with a 23 or 30mm aircraft cannon. The weapon was remotely test fired by the ground controllers when the station was unmanned. $\endgroup$ – Thucydides Jul 14 '18 at 6:53

It will shoot, and its bullets will be just as deadly (or if the targets life support depends on a space suit that can be punctured, even more deadly). However the recoil can have unexpected effects on the bearer: In weightlessness, if he/she is not fastened to something, he/she will float away and spin up, making repeated shooting much harder.

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    $\begingroup$ @TimBII Explosives do not require external air: they contain oxidiser, saltpeter for example in the case of black powder. Torpedoes and mines can explode underwater... $\endgroup$ – b.Lorenz Jul 12 '18 at 6:07
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    $\begingroup$ @TimBII In addtition to what b.Lorenz wrote: most modern ammonitions use nitrocellulose, which has also its own oxidiser $\endgroup$ – DarthDonut Jul 12 '18 at 6:19
  • $\begingroup$ @TimBII see worldbuilding.stackexchange.com/questions/89557/… $\endgroup$ – Aify Jul 12 '18 at 7:12

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