That is sort of like asking what is the best flavor of ice cream in the world- different people have different opinions. There is no one answer to the "Best .40 cal" in the world.
Sig Sauer P229 chambered in .40 is pretty good
You need to define best for WHAT. There is no one "best".
it is definitely the sig sauer sp2022
Best left to a gunsmith
A water pistol is not a FIREARM. You are in the wrong place.
Very likely, it's the Glock. Glock in general is the best selling pistol in the commercial and law enforcement market.
any single or double action semi-automatic pistol listed as a 40 caliber pistol...............
Yes. It is considered a good quality pistol.
No
By pulling the trigger... :P
Yes.
$200