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Is it ok to shoot an air gun (also known as a "BB gun") to knock over cups on Shabbos?

I can't think of any reason to prohibit it.

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@Sam, that discusses a regular gun which functions by the combustion of gunpowder which is a melachah. An air gun, it would seem, does not involve such a melachah. –  Yirmeyahu Aug 5 '13 at 2:49
    
There could possibly be a problem of destroying a vessel by putting holes in it, but this relates to the target, not the weapon. There is also judaism.stackexchange.com/questions/12605/… which could be relevant. –  Epicentre Aug 5 '13 at 4:37
    
Shabbos 63a: Weapons are Muktzah on Shabbat. –  Menachem Aug 5 '13 at 4:40
    
@Menachem Maybe that would be a problem with marit ayin, but BB guns only mimic weapons. They're toys. –  A L Sep 4 '13 at 19:29
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3 Answers

It can be a problem of Zorah (winnowing) because of the thrust of air.

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What are you separating? –  Double AA Sep 23 '13 at 19:43
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What is the separating when spitting and the wind carries the spittle, mentioned in the very end of Siman 319? –  yosef stern Sep 24 '13 at 5:53
    
@yosefstern When you spit in the air, the wind breaks the spit apart into smaller "pieces" rather than being one big glob of spit. –  Daniel Sep 24 '13 at 17:09
    
@Daniel separating the same thing into many pieces is not 'separating' as far as Shabbos Melochos are concerned. –  yosef stern Sep 24 '13 at 19:00
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Might be muktzah depending on the model. There are airsoft guns made to resemble specific real weapons as closely as possible for training. One of those might be assur to use for reasons of uvdin d'chol but I can't think of a reason to forbid a toy BB gun.

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It's fine because no melocho is involved and it's not winnowing because the bb and the gun were never one entity to begin with.

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You could improve this answer by supporting what you say, particularly that it's not melacha. Right now we can only take your word for it, and most of us don't know you. Can you bring a source? Thank you. –  Monica Cellio Mar 3 at 2:43
    
probably should be a comment on yosef stern's's answer –  Shmuel Brin Mar 3 at 4:11
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