The fourth Hardcover book in the series collects the "Man of Stone" and "Widowmaker" arcs.
In "Man of Stone" the Punisher travels to Afghanistan with an old friend. Yes he does have a couple. In "Widowmaker" the wives of past Punisher victims ban together to stop him. Collects Punisher Max #37-49.
Punisher Max #37 Punisher Max #38 Punisher Max #39 Punisher Max #40 Punisher Max #41 Punisher Max #42 Punisher Max #43 Punisher Max #44 Punisher Max #45 Punisher Max #46 Punisher Max #47 Punisher Max #48 Punisher Max #49
— Description from Comic Vine community (comicvine.gamespot.com).
