Can i use 12mm bbs on my 6mm airsoft gun?

3 ANSWERS

1. 
   

   Can you fit something in a hole that is half the size?  No.  
   
   Do you mean .12 gram BBs by chance?  those are still 6mm they are just cheap and crappy.

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2. 
   

   mm stands for millimeter. basicaly...
   
   12mm this space |______|
   
   but 6mm this space |___|
   
   (not to scale)
   
   so a 12mm BB cannot fit in a 6mm barrel. but the worst thing that could happen is probably nothing at all. the BB just won't load. if you look around you may be able to find a 12mm barrel to put in your gun but it'd be easier just to buy a new one.
   
   you may be confused. if you mean the weight of the bbs it's .12 grams .20 grams and .28 grams and yes these are exchangeable the heavier the bbs the more accurate but the less powerful(and are more expensive).

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3. 
   

   Nope, won't fit.
   
   If you try to load them you're liable to jam the thing up but good. They will not fit into the barrel, and thus will not shoot.
   
   They could still perhaps fit in the magazine or into the action and become stuck, or cause a moving part to strike them and break.

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