Interesting. This M4 RAS was a new one direct from Knights. They told me a few months back they were out of stock for civilian orders because they were fulfilling a DOD contract. When their website showed them in stock again (within the past 4 weeks), I ordered quickly. This Colt Commando 6933 is about 4 years old and was a safe queen. From my unprofessional opinion, and using small flashlights to examine the issue (with the help of my wife), it definitely was a barrel nut tine issue on the left and right side.

