Typically a bit of massaging of the ejector does the trick. Round off the square edge of the ejector that is closest to the firing pin.
This changes the pressure/angle that it pushes on the brass ever so slightly. I had never seen it before until a friend of mine clued me into it.
Also, unless it's kicking brass a LONG way forward I wouldn't worry about it too much if the gun shoots good. By a long ways I'm talking like 5 feet or more and landing well in front of the muzzle. Like a good 2 or 3 feet in front. And keep in mind this "rule of thumb" really only applies to 223 rifles, different cartridges react to the system differently and case geometry changes how the brass comes out of the rifle, due to how it hits the deflector, and how it exits the port on the receiver.
For example due to the short case 300 Blackout will nearly always come out of the rifle and fly @ the 5 o'clock position.
