This is interesting.
http://www.thefirearmblog.com/blog/2017/04/13/counterfeit-m4s-iraq/?utm_source=Newsletter&utm_medium=Email&utm_content=2017-04-18&utm_campaign=Weekly+Newsletter
http://www.thefirearmblog.com/blog/2017/04/13/five-supposed-mauser-firsts-werent/?utm_source=Newsletter&utm_medium=Email&utm_content=2017-04-15&utm_campaign=Weekly+Newsletter
Rimless ammunition
General Julian Hatcher, and others, credit Paul Mauser with the invention of rimless ammunition...