Throughout the series, violence can be depicted, however this is usually displayed with mild impact.
In several episodes guns are shown, and in a few episodes people are shot (no blood or gore shown) however reactions are heard.
People are threatened in the show, quite often, sometimes resulting in physical violence.
References to murder, rape and other acts in the same vein are discussed (not for comedic purpose)
One of the characters owns a variety of guns, which occasionally 'go off' in his office.
In one episode a mans fingers are chopped off with an axe (off-screen), however the outcome is shown (moderately bloody)
Other episodes contain some violence, however most of it is off-screen, implied or mild