I have also read the praises and criticisms of the Sig 556, and would have come to your conclusion as well, right up until I reloaded with the Remington ammo, and the problem went away. Granted this is a new rifle and may "loosen up" after more rounds. I have also read, researched and heard about the criticisms of ammo from Chile, Russia, Israel, Turkey, etc.. and just wonder if the ever so slight differences in manufacturing may play a role in a brand new rifle. BS or not, I'm just sharing my experience.