Has anyone heard of trueing the face of an AR upper? Where the barrel es in and rests I have been convinced that the surface of the upper receiver is not true. When you tighten the barrel but to the upper your barrel will be influenced by the uneven surface and minutely corupted to an angle. The barrel on my next gen was pitched down and left. For those of you who zero at 100 and shoot at 100 this is unnoticeable and doesn't matter. For those of you who like to use the turrets on your scope you may be a better shooter than you thought you were. If your scope is straight and your barrel is just a bit off any adjustment you make to your scope will not be honored by your barrel. The only guy I know of who is doing this is Will at HX2 arms in Salem. Your thoughts? Your opinions? Your facts?