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Discussion Starter · #1 ·
I don't have a .40 nor do I shoot .40 but I was wondering if there are any difference between the 9mm and .40s&w other than the mags & barrels. Is the barrel outside diameter different on the .40?

This is just morbid curiosity.
 

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Not much other than the diameter of the muzzle opening on the slide. You can buy after market barrels that are bigger in diameter to compensate for this to make a conversion from .40 to 9mm on most HK pistols.
 
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