Hello, how i can convert mp15 to a pistol?

You can't, not legally speaking.
 
A little off topic, but when building an AR pistol, it's important that the stripped lower receiver be designated a pistol when it is first obtained from an FFL.

The problem with that is an un-built receiver is listed on the 4473 not as a pistol, not as a rifle, it is listed as OTHER and cannot be transferred to a person under 21.
 

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