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Will a .40 barrel from a g22 fit in a .357 g31? I know the .40 guns can be converted down but how about being converted up?
 

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Yep just as easy!
 

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You can swap .357 and .40 barrels, because it is not considered to be going up. You can't convert a 9mm Glock to .40/.357, but you can swap .40/.357. I believe you can even use the same mags.
 

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yes same mags. you can also use 40/357 mags with 9mm ammo and they have always functioned fine for me.
 
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