Shooting is the most common type of violence in the series. Some other examples are stabbings. All of these examples are almost always portrayed with varying degrees of blood letting. Corpses of deceased characters are sometimes shown, with some bloody imagery.
Season 1 and 3 have 1 or 2 instances of gory violence but the rest is quite tame. Season 2 has the most deaths but almost all of the violence is offscreen. Season 4 has a lot of shooting with some mild blood and one instance of a stabbing.
Season 1: Some people are shot offscreen. Violence is infrequent but when it happens, it can get somewhat bloody (but not graphic). The most violent scene in the season features a man killing his wife with a hammer. It is fully offscreen but the body is seen for a few seconds with bloody wounds. A scene shows a man snapping his bone back into place in his leg on screen although not graphic it maybe too much for squeamish people.
Season 3: Almost no bloody violence except for one graphic decapitation shown very briefly and a man removing glass from his neck and blood pours out. Other than that, there is some onscreen shooting but nothing graphic.
Season 2: A lot of shooting with bloody results, including a shootout where in a man is seen with a severed leg before being killed offscreen. A lot of characters are shot and killed mostly offscreen.
Season 4: Not very violent some shootings with some blood, most are offscreen. One instance has a man shot in the neck with an air rifle with lots of blood, another has a man stabbed to death mostly offscreen.
Season 1 is the most violent and gory.
Season 4 is the least violent.
The show mostly contains shootouts with some blood, most of the violence is delivered in a cartoony way almost inspired by westerns. Some of the more grisly and gory content may disturb some but is fairly rare.
Season 4: Violence is milder than other seasons. Shootings and stabbing shown frequently. There is a very graphic scene where a man shoots himself in the head, that is the worst violence shown.
TV-MA violence type: blood, gore and graphic.
Strong bloody violence.