I have read for a detrimental though, the end just isn't great for a $400 trigger and I feel it based on photos. Then also some do complain they do not work ideal - suspect it is actually related to non spec bolt carriers (many AR's out there include versions, https://buy-rare-breed-triggers23456.vblogetin.com/40467805/detailed-notes-on-rare-breed-trigger-frt