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I am new to the MP5 world. I am wondering what does it take to convert the stock HK MP5 9mm to a .40S&W? What additional part would I need? Thank you for your time.
 

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It takes quite a few additional parts actually. The receiver is completely different to start with. Let's put it this way the only things that the 40 and 9mm share are the sights, push pins, cocking tube end cap and rear A2 stock.
 

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You would have to graft a .40/10mm magwell/bho , swap trunnions, barrel, different bcg and ejector lever
 
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