I have read being a destructive however, the end just isn't perfect for a $400 trigger and I feel it determined by photographs. Then also some do complain they do not work right - suspect it really is related to non spec bolt carriers (lots of AR's out there include https://rarebreedtriggerswebsite90123.bloggip.com/34799238/a-simple-key-for-buy-rare-breed-trigger-unveiled