I bought one from SFRC a few years back. It went back to NS for repairs twice within 200 rounds fired. It broke a third time very soon after. I fixed it myself this time. I sold it very soon afterwards. Both repair jobs NS did were adequate. And turnaround times were respectable. It was just a production dud lemon I happened to own. Considering AO been making firearms close to a 100 years, you would think they know what they are doing. They don't when it comes to the M1 carbine. Buyer beware with M1 Carbine.
On a side note, when the rifle did function, I absolutely loved it. It shot very straight and I love the .30 carbine round. They would make a excellent trunk gun due to their size and caliber. Its just a shame all the Tula .30 carbine has dried up in Canada.