Attachment 45359
There's a lot of variation between M1 carbines when it comes to accuracy. My CMP Italian return is capable of quite good accuracy, certainly better than I expected when I got it, but the Italians took real good care of it. The attached picture shows a target I put 15 rounds of S&B fmj into at 100 yards using my range bag for a rest. The flyer is entirely my fault. It isn't M1 Garand accuracy but still not bad at all The little rifle will definitely hold "minute of thorax" at 200 yards.
My carbine as I received it, did have occasional failures to feed, about once every 100-150 rounds or so, but re-springing it fixed that almost entirely and now any failure is very rare. I should also say that an M1 carbine feed or ejection malfunction is very, very easy to clear in my experience.
Magazines are always semi expendable and damaged magazines are always a source of malfunctions. Add to that the fact that M1 Carbine magazines aren't the most robust I've ever seen and I can understand a high turnover rate.