This was a Stag lower that we tried to place it in, not that you choose to'd provide the similar difficulties. I will test it in a few other brands lowers to find out if that changes something. Tag for information. I've an more mature Stag sixteen" 9mm AR with https://rare-breed-frt-trigger13356.blogsvila.com/35956740/rare-breed-frt-no-further-a-mystery