Well, finally had a chance to go shoot my Ruger Carbine after it's second trip back from Ruger. They replaced the barrel with a new one, and once again had the same failure. Now I have to contact them to see what my options are since this will be the third time it will be going back. I am going to try and make a tutorial Friday night of how to recreate this issue, since I've been able to do it with multiple carbines. I'm leaning towards either my receiver is out of spec now, or a design flaw if I can produce it with multiple carbines.