The legendary M1 .30 Caliber Rifle has humble beginnings. No legend is born without flaws, and the M1 Garand underwent a number of substantial redesigns and modifications to address issues as they were discovered.
Note of Clarification (7th Round Stoppage): The affected receiver rib is on the left side, but counterintuitively it induces malfunctions with cartridges on the right side. As I understand it, that rib helps guide the nose of cartridges from the right-side as they turn to enter the chamber. Without it, the cartridge can miss the chamber and cause a failure to feed.
I goofed that up while filming and am fixing it now as best as I can (sorry). I expect additional confusion because it is misquoted elsewhere on the internet that the right-hand FTFs were caused by the right side receiver rib. But as you can clearly see it is the front left-side receiver rib that was affected and repaired. Then the Garand Collectors Association (GCA) demonstrated with an original un-repaired early M1 that the malfunction occurs on the right-side.
GCA: thegca.org/7th-round-stoppage-project/
GCA Video (it's pretty great): th-cam.com/video/IuDy74KE5LE/w-d-xo.html&ab_channel=CivilianMarksmanshipProgram
Final Note: Yes, this is the same Turkish return M1 that had the note in it (see previous video th-cam.com/video/UXqPOb4nCIk/w-d-xo.html). It's the Garand that keeps on giving.
Thanks for watching! -Omelette