Moderate R-rated violence.
The protagonist's kidney is stolen (mostly offscreen, although at some points we see very brief flashbacks of surgeons cutting into him, with some gory shots--nothing you wouldn't see on an episode of CSI).
A few shootouts take place throughout the film, although aside from some bloody CGI headshots, there is nothing particularly graphic shown.
Some moderate fist fights with blood occur, although like the shootouts, there is nothing all-out graphic, with the exception of a character getting a broken bottle in his neck.
An elderly man is hit with the butt of a shotgun--he goes down, but he lives.