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What is the origin (etymology) of the word مسدس (pistol)?

In Arabic the word مُسَدَّس refers to pistol when an arm is meant (see [here](https://ar.wikipedia.org/wiki/%D9%85%D8%B3%D8%AF%D8%B3_(%D8%B3%D9%84%D8%A7%D8%AD)) on wikipedia).

But it also refers to a hexagon (see [here](https://ar.wikipedia.org/wiki/%D8%B3%D8%AF%D8%A7%D8%B3%D9%8A_%D8%A3%D8%B6%D9%84%D8%A7%D8%B9) on wikipedia) -also سداسي أضلاع or سداسي- as it is a description of a geometrical object that has six edges. 

As the number:
> six سِتَّة

while anything related to this number might be:
> سداسي  
> مُسَدَّس  
etc.

I wonder if there's a connection between the word مُسَدَّس (pistol) and the number six and what it is?

I must guess maybe the first pistol had six bullets and that's why Arabs named it so, but I want so clarity.