I have read through as a destructive though, the end isn't perfect for a $four hundred trigger and I feel it based on images. Then also some do complain they do not work ideal - suspect it's related to non spec bolt carriers (a lot of AR's available have variants, https://rare-breed-trigger-upgrad56799.blue-blogs.com/42124858/getting-my-rare-breed-trigger-3-position-to-work