Well it seems like I’ve finally done something wrong to this gun. She’s failing with disturbing regularity. Sometimes the round doesn’t make it into the chamber, and instead get bit by the bolt. Sometimes the bolt cycles and doesn’t grab anything. Sometimes the bolt-hold open device fails to engage.
After some substantial troubleshooting, I determined damage had happened to my bolt and bolt hold open device, possibly due to resting on a magazine, but also potentially from the magpul p-mags that I’ve been using. You can see the way they interact . . .