Is it only with one brand and loading of ammunition or more than one brand? That's the easiest thing to test. Some lots of rimfire ammunition can be touchy and maybe cause the problem.
How many rounds through? When did you last detail strip and clean it?
I've not seen it, sorry. My guess is crud in the firing pin channel. Maybe throw the whole bolt in a sonicator for a while then strip it down?
I've had that happen when the trigger pin walked out just a little bit
I've had that happen when the trigger pin walked out just a little bit
This sounds like the same thing that got the 15-22 banned from Appleseed. It was supposed to be a temporary ban, that was two years ago.
https://www.thefirearmblog.com/blog...appleseed-events-due-run-away-battery-firing/