The problems with the M-1 Garand were that the cartridge itself was too long for a fast cycle rate of fire. That`s why they shortened it to .308. The shorter cartridge means the bolt does not have to move so far back in travel. They can then also shorten the bolt too. The other problem was with the magazine system. Only 8 rounds and it couldn`t be topped up I don`t think. Then, when the last round was fired it also ejected the clip that was holdong the cartridges. Apparently from what I have read, the enemy would then know when the person with the Garand had an empty rifle. Of course the .30-06 round also went the way of the do do bird too because you can pretty well carry about twice as much ammo with the 5.56 and the recoil in the Garand would cause soldiers to flich. The open bolt design also allows more dirt into the actions as well. All of these issues were addressed with guns like the AK-47 and M-16. But the M1- Garand is still a well built rifle and still kicks butt against an opposing force armed with bolt-action guns.It really did help win world war 2.