Just put together my AR15. The upper assembly came completed. I decided to take it apart and see how it all fits together (field stripping, not completely tearing it down). I pulled the little cotter pin, the firing pin and the cam bolt out of the bolt carrier group.
I didn't notice when I took it apart which direction the "sprocket" that locks the bolt in place faces (I didn't take note before I let it spin). Is there a particular direction the flatter spot needs to face or does it not matter?