Update: Had exact same experience with identical behavior, received the modified back-ordered latch and after having it installed over 1000 rounds ago my Ethos has run perfectly. It has been easy to forget the earlier problem and I am VERY happy with it. The new latch appears to have been modified individually as you describe by a highly skilled technician---I will attach photos of the original latch with the new one to the right. BTW, no visible wear on the sharper edge of the new latch so far.