After Heckler & Koch sued German Sports Guns GmBH) and American Tactical Imports (ATI) on the GSG-5 .22 rifle and won in 2009, the later two sued back earlier this week for US$16.5 million in damages. They assert the H&K does not own the rights to the MP5 design. The 2009 court case was settled for US$300,000 and if this goes to a hearing, it would be interesting to hear the arguments.