John Wick written by Derek Kolstad, directed by Chad Stahelski

Improbable sequences of people using guns like everyone else uses words.

The underworld shown has a couple of anarchic elements: 1) a safe hotel, where management promises to kill anyone who attempts to kill any other guest, 2) a gold coin mint, that mints high dollar value coins accepted throughout, and 3) trustful relations between "good" underworld citizens and overworld police.