I was sighting in a few of my most recent builds yesterday and had what I thought to be a failure to feed. It just happened to be on my last round of that magazine so I cleared it and set it aside. After further inspection, I noticed a couple lugs were missing. I will be contacting the vendor tomorrow and will wait until then to disclose the vendors name and my customer service experience. This occurred on the 18th round fired through this gun. I shot 3 3 shot strings of AE223 55gr FMJ and then the bolt failed on the second to last round of a 10 shot group of Winchester Q3131A.

The barrel extension and chamber appear undamaged, but I'm not going to fire it until I talk to the vendor first.

Update: I received the replacement bolt on Monday, only 1 week after calling it in. The replacement does not have the TM stamp. I hope to shoot on Saturday.