I've go through as being a damaging however, the finish isn't perfect for a $400 trigger and I think it depending on shots. Then also some do complain they don't work ideal - suspect it is actually associated with non spec bolt carriers (many AR's out there come with variations, https://troywpfvm.bloguerosa.com/33677630/5-simple-statements-about-rare-breed-forced-reset-trigger-explained