Didn’t realize it was Texas Cowboy’s rifle.
It was my understanding that they never came up with an answer.
The only think I could think of would have been a metal shaving inside the bolt locking the firing-pin into the “fired” position, causing a slam-fire, but even that explanation has weaknesses.
A slam fire would have exited the barrel the same as an intentionally fired round. The rifle was pointed down range and it wouldn’t have been a safety issue.
TC and humblegunner had fired it previously and I had just fired the twelfth round. When it comes to firearms I have no arrogance at all and will request a step by step walk though as if I had never fired a weapon before.
In my opinion we did everything right the Garand had some internal problem that chose to raise it’s head on magic thirteen. Springfield apparently chose to keep the answer to themselves.