Here’s What You Need to Remember: Gun designer Eugene Morrison Stoner (1922-1997) hit a perfect bull’s eye with his AR-15/M-16 design, but he didn’t immediately get there the first time out.

Summary and Key Points: The M16 rifle, designed by Eugene Stoner and adopted by the U.S. military in the 1960s, has remained a staple due to its reliability, modularity, and effectiveness.