The M1 Garand ran great in testing, but as soon as Springfield began to crank out production-line guns a mysterious problem appeared. If the top round in the clip was on the right-hand side, the 7th round in the clip would often run askew and malfunction. Where did this very odd problem come from, and why the connection to how the clip was loaded?
In a classic example of "guns are hard" going from prototypes to production line tooling, Springfield had to figure out the problem while the War Department was busy sending hundreds of problem rifles to Camp Perry for public demonstration...
Reference source for this video is Julian Hatcher's "Book of the Garand":
VIDEO HERE (11:30 minutes)