Exhibit 4 THIRD AMENDMENT TO RIGHTS AGREEMENT ----------------------------------- Third Amendment, dated as of March 16, 1999 ("Amendment"), to the Rights Agreement, dated as of September 28, 1990, as amended (the "Rights Agreement"), between Alliant...Rights Agreement • March 23rd, 1999 • Alliant Techsystems Inc • Ordnance & accessories, (no vehicles/guided missiles) • Delaware
